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
Use non-minified version in bower
Build dist files.
Image url input now handles paste events.
Fresh build.
Support insert Youku video.

The width and height value comes from the official website's embed code.
Update dist files
Merge pull request #469 from linjunpop/youku-video
Update video providers with language files
Merge pull request #445 from JohnRandom/master
Merge branch 'JohnRandom-master'
Update spanish lang

Add superscript & subscript title, and modified "italic" from "Itálica" to "Cursiva"... it's more common this trnaslation
Merge pull request #470 from eleazan/patch-1

Update spanish lang
List fonts supported by the system. Update font lists and default font name.
adding data-filename for future use and api-based uploads
synced with upstream
Merge pull request #473 from HackerWins/check-system-fonts

List fonts supported by the system.
Update diet files.
createLink: expand range by anchor.