Fix reference to null object

to avoid rng.isOnEditable on a null object
Merge pull request #173 from glad2learn/patch-1

Fix reference to null object
Build dist files.
adding data-filename for future use and api-based uploads
synced with upstream
resolved merge conflicts
Update version for next release.
Changed the name of font-awesome for correct package
Merge branch 'master' into develop
Merge pull request #508 from brunobatista/patch-2

Changed the name of font-awesome for correct package
Merge branch 'master' into develop
Fixed #449.
Merge develop
Extract codemirror.autoFormatOnStart option.
Update dist files.
Merge pull request #517 from HackerWins/develop

v0.5.3
Update summernote-de-DE.js
Missing the inverteds question mark in es-ES

Fix a little error in es-ES lang file, where the author forget the inverteds question mark
Fix for issues like #516

Fix a crash when a toolbar button does'nt exist. Now not appear, but no crash the js. Maybe some warn like "The button {blabla} not exists, not rendering" will be fine! But i don't want use the console.log/error that can crash in ie :/
Fix Travis CI

A space-failt at travis :(