Added automatic versioning.

--HG--
extra : rebase_source : 429b44e9a30b89de36ef2ab437ff5d8e627ae8f8
Better authentication handling:
- Not bundling user info with every response anymore.
- Ability to optionally bundle user info with the page read API endpoint.
- New API endpoint for current user info.
Fixed crash creating pages in new folders, or with spaces.
Cosmetic template change for meta pages.
Small optimization.
Cosmetic changes for sub-titles/decorators.
Fix link to profile page.
First version of endpoint customization.