integration of doc

integration of doc by gaspard
ADD Cancel button
Merge branch 'master' of https://github.com/sitexw/BackNode
Merge branch 'master' of https://github.com/sitexw/BackNode
Rewriting the code that creates the blocks above the editable areas
Merge pull request #14 from Belgarathgas/master

Rewriting the code that creates the blocks above the editable areas
Optimization script blocks to hover when resize the iframe
Merge pull request #15 from Belgarathgas/master

Optimization script blocks to hover when resize the iframe
Adding comment codes Valentin
Merge pull request #16 from Belgarathgas/master

Adding comment codes Valentin
Add tools
Merge branch 'tools'
ADD Loading screen
ADD Import background
Hide/Show left buttons
Merge pull request #18 from Belgarathgas/master

Add tools
Merge pull request #2 from lexoyo/master

added support for css classes as selectors
Merge pull request #7 from lexoyo/master

added instructions for webdesigners, license info, badges for travis gem...
Merge pull request #19 from H4ris/master

Final merge
Merge sitexw/master
Fix some merge issue
Refacto, delete external lib file, rollback to classic cloud explorer (wait new version), fix make and grunt/jshint/uglify