Add srcset attribute to img element schema
Add picture element support
Add srcset support for source element
Fix colorpicker function in compat3x plugin
Merge branch 'master' into srcset
Fixed bug where IE 7 wouldn't be rendered properly due to to aggressive css compression.
Fixed bug where DomQuery wouldn't accept window as constructor element.
Added better error reporting form amdlc grunt task.
Merge pull request #428 from mattheu/srcset

Add srcset attribute to img element schema
Merge pull request #429 from mattheu/picture

Add picture element support
Updated changelog.txt
Merge pull request #443 from Callidior/compat3x

Fix colorpicker function in compat3x plugin
Updated changelog.txt
add grunt-cli to list of dependancies

This allows a single 'npm install' to install everything required to
build TinyMCE.