* customTime read-only (i.e. editable = false) patch.

* updated docs for read-only customTime patch

If when the verticleAnimationFrame callback fires, and the item no longer exists, (it has no parent), then we need to silently ignore that frame

* initial trial

* Add onInitialDrawComplete

* Add docs

* Add to eventListeners examples

* Keeping things DRY

* Remove callback insertion

* Remove call

* Add onTimeout

* Prepare bailing in stack

* Initial bail function

* Better written bail function

* Clean up

* Fix and cleanup examples

* Add onTimeout docs

* Remove core.js changes

* Readd newline in corejs

* Fix example title

* Fix review comments

* initial trial

* Add onInitialDrawComplete

* Add docs

* Add to eventListeners examples

* Keeping things DRY

* Remove callback insertion

* Remove call

* Add initial loading screen

* Fix real initial draw call

* Remove activateOnInitialDraw method

* Add loading screen option

* Add docs

* Remove onInitialDrawComplete double doc

* Simplify example

* Simplify stressPerformance example

* Remove extra line

Removing duplicate line

* initial trial

* Add onInitialDrawComplete

* Add docs

* Add to eventListeners examples

* Keeping things DRY

* Remove callback insertion

* Remove call

* Fix initial real first draw complete and fix comments from review

* remove all <code><code>

* Make items redraws return queues

* Parallel initial items redraw

* Seperate read and write actions in items

* Parallel all items redraws

* Remove comments

* Fix linting comments

* Fix redraws on actions

* Seperate group read and write

* Add objects that can be dropped to items

* Move example

* Fix group get/set group properties

* Add documentation

* Remove console.log

* return Group.js changes

* Fix review comments

* Fix example

* Update drag&drop.html

* Corrects usage of @static jsdoc annotation

* Correct unresolvable types

* Correct types in jsdoc and remove extraneous @class & @constructor jsdoc

* Remove incorrect @static jsdoc

* Adds missing jsdoc for param copyFromGlobals

* correct jsdoc in util

* Corrects casing on jsdocs

* Swaps @inheritDoc to @ignore for constructors where constructor args are documented in the class

* Instantiates Errors with `new`

* Addresses improperly defined @callback tags.

* Split callbacks out to separate jsdoc

* Moves constructor jsdocs back to constructor and drop @ignore.

* Adds missing @extends for constructors

* Adds names to constructors

* Tightens up jsdoc lint rules on timeline

* Adds missing options param

* Change lint rules

* Get eslint passing with require-jsdoc

* Bidirectional scrolling.
Make horizontalScroll and verticalScroll work together.

* Fix delta variable declaration

Using ?: operator

* Remove notice about vertical and horizontal scroll conflict

There is no sense considering #3162

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

* Add .travis.yml file

* Add experiment travis code

* Fix react example

* Add drop event info

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

* Add .travis.yml file

* Add experiment travis code

* Fix react example

* Add callback functions to moveTo, zoomIn, zoomOut and setWindow

Fix proposal for issue #2842

More details here : #2842

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

* Add .travis.yml file

* Add experiment travis code

* Fix react example

* Add animation options for zoomIn and zoomOut

* Fix groupEditable
* Fix group drag in vertical direction bug
* Fix indentation
* Add initial nestedGroups property
* Fix redraw order
* Get nested groups hiding working
* Add order to nestedGroups
* Fix up example
* Add support for intially closed nested groups
* Add nested groups indentation
* Fix indents
* Add nested groups docs
* Fix example
* Revert indents
* Add classes to nested and nesting group labels and add nesting group css
* Use pure css for nested group icons
* Remove commented off lines and unnecessary btn
* Fix indents
* Add support to showNested:false in group
* Add semicolon
* Remove empty lines

* Add initial support for rolling mode
* Add rollingModeBtn and simplify example
* Make icon in css:
* Remove icon btn
* Add docs
* Fix zoom in rolling mode and initial start/end times

* Add support to fixed times drag and drop
* Fix IE support for drag and drop
* Add support to IE pointer location and data setting/getting

* Fix left/right group alignment
* Add _setDOM and remove scrollbar when there is no scrolling
* Readd calculation of scrollbar width on resize

* Fixes #2273
* Remove console.log
* Fix for zoomable false
* Fix initial scrolling with verticalScroll and fix example

* Add initial experiment
* Register drag and drop events
* Add initial drag and drop support
* Add drag and drop support for all types of objects
* Fix example
* Clean up code and add comments
* Fix example
* remove font awesome
* Fix example style
* Add meta tag to example and add selected when dropped

* Add zoomIn and zoomOut to timeline core functionality
* Fix example
* Fix jsdocs params
* inforce zoom percentage to be between 0 and 1

* Add initial scroller without options
* Add initial scroll without an option
* Add verticalScroll option
* Fix scrollbar positions
* Add docs
* fix example
* remove jquery dependency
* Fix example
* Fix review comments
* Fix verticalScroll and horizontalScroll docs
* Fix bug in timeline option.rtl if otion is undefined
* Remove hack
* Fix breaking of timeline
* Fix scrolling bugs
* Remove silly mistake

* Add initial scroller without options
* Add initial scroll without an option
* Add verticalScroll option
* Fix scrollbar positions
* Add docs
* fix example
* remove jquery dependency
* Fix example
* Fix review comments

* Hide vertically hidden ranged items in groups that are not visible
* Add vertical scroll when zoom is inactive
* Fix review comments
* Add horizontalScroll option

* Hide vertically hidden ranged items in groups that are not visible
* Add vertical scroll when zoom is inactive
* Fix review comments