Merge pull request #445 from intportg/dev

Dev
[FIX] issue with rbs-rich-text-input and tablets
[UPDATE] Improve Timeline Message UI
Merge pull request #446 from renaudJennyRBS/timeline

Fix richtext on tablets bug and improve Timeline Message UI
[NEW] Defining 'raw' visibility for a block renders it without the div container.
[NEW] Add HeadMetas block in SEO module to generate SEO page metas.
[NEW] Thread now ends with the current document title instead of its detail page's one.
[FIX] HeadMeta block.
[FIX] Thread and HeadMeta blocks.