Add Browser Support

Add on browsers tested.
Merge pull request #300 from randsonjs/patch-1

Add Browser Support
Upgrades dev dependencies
Updates browser infos
When looking for parent elements, do not traverse past the nearest containing medium editor.
Merge pull request #303 from yacomink/master

Scope findMatchingSelectionParent to current editor
Added justify* buttons
Merge pull request #307 from JoTrdl/master

Added justify* buttons
Fix #308 by passing clipboard content through self.htmlEntities before inserting
added tests for onerror exploit with disableReturn false and disableReturn true
whitespace fix
Merge pull request #309 from pascalpp/disableReturn_exploit

Fix #308 by passing clipboard content through self.htmlEntities
Check editor element for data-disable-return on return, not the target element of the keyup
Merge pull request #311 from yacomink/master

Check editor element for data-disable-return on return
fix bug this out scope
1.9.7
Merge pull request #313 from alexandref93/master

fix bug this out scope
Updates grunt-sass
Updates dist files
1.9.8