* Hide vertically hidden ranged items in groups that are not visible
* Fix misspelling
* Fix examples that do not contain groups
* Add example for vertical hidden ranged items
* Fix indent format in RangeItem
* Fix example
* Fix other examples after addition of vertical hiding range items in groups
* Add case of zero margin axis

code cleanup;

Add flag to check whether an item in the Itemset is currently being dragged

It was broken by PR (#1729), which fixed issues #112 & #1730.
As far as I can tell that change shouldn't influence the DataAxis (vertical-axis), but only the horizontal axis.

 @yotamberk can you check if your examples still work as expected?

Internet Explorer does not support the ES6 Number.parseFloat (see http://caniuse.com/#feat=es6-number). Instead, substitute the regular parseFloat method.

Moved initial autoscale/fit method to an handler of the "changed" event.

Cleanup of linegraph's event handling
Fixed #1557: Make sure we don't default to scientific notation.
Couple of minor fixes in group counts and ranges.

-Keep single defaults location
-Update documentation on formatting function.