Merge pull request #818 from inthause/documents

Update Admin Order edition
Fix #737
Add field document select
Use document select for page template. Fix #642
Enhance the page editor to display the not editable block
Fix website editor aside
Fix link to document in document select field
Merge pull request #819 from loiccouturier/master

Fix some tickets
Module Mail UI
Refactor User account request to use new Mail
Begin Theme UI refactoring works
Mail templates and Page templates are now separated
Mails Installation
Change the default sender key in project configuration
Merge pull request #820 from renaudJennyRBS/template

Refactor Theme Interface, add Mail stuff
Calling UpdateCart on a locked cart now creates a new cart from it.
Remove ordered property from cart and add orderId and processing ones.
Fix document list toolbar in Chrome.
Delete old unused file (cf generic module for the listener).
Fix exception on page rendering if there is an empty editable zone.
Comments and code formatting.