Documentation update
Merge branch 'develop'
Cleaning doc
Fix #15 - Reload detects changes in "_"-prefixed folders
Change code style to PSR-1/2
Increment version to 1.3.1
Fix behat features failing because of trailing line
Fix #15 only for _layout folder
Increment version to 1.3.2
Try to fix Travis errors generated by Github rate limit
Fix issue with cached twig files were not really reloaded
Merge branch 'master' into develop
Switch to "official" Markdown library and its "Extra" version

Need of the "Extra" version to have Markdown rendering inside HTML
block-level tags.

One deleted because the official library is static and mocking a call to
a static method is painful