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
Update summernote-fr-FR.js

1) Add button toolbar 'superscript' and 'subscript'
2) Finalize button toolbar 'strikethrough'
Allow developers to use summernote source as requirejs package
Update EventHandler.js

did it miss-typed ? ;)
Update EventHandler.js

wrong func calls :(
Clear input[type=file] in imageDialog.

This patch clears `input[type=file]` in `imageDialog` before using it.
Create summernote-fa-IR.js
Merge pull request #302 from amir-yeketaz/patch-2

Create summernote-fa-IR.js
Merge pull request #300 from lqez/clearing_file_input

Clear input[type=file] in imageDialog.
Merge pull request #290 from lastmirage/patch-1

Update EventHandler.js
Merge pull request #291 from lastmirage/master

Update EventHandler.js
Build: #290, #291, #299, #300
Refactoring: extract keymap setting.
Add onpaste handler for #303.
Fixed #267, #308 and Update bootstrap version.
 - cause by #229.
Update README.md
Update version for next.
close modal correctly by passing hidden.bs.modal event to parent elements
fix typo