Upgrade packages and tools for Travis unit testing (#3262)
* Add C++11 and canvas module for travis tests
* Added libgif, updated version gulp-clean-css
* Update version webpack
* Force versions minimatch, graceful-fs; fixes for upgraded webpack
* Force version minimatch through travis.yml
* Fix comma's in json
* Add extraneous modules to package.json; final attempt at forcing versions of minimatch and graceful-fs
* Final changes module versions
* Fix due to linting
* Fix typo in package.json
* Upgrade eslint