Add new utility functions

- get absolute position of a block
- convert tex unit to px
Fix minor issues
Improve preview directive
Update previews when the revision change
Count number of page via synctex
Improve current line highlighing
Include mobwrite library
Create an ACE mobwrite client
Synchronize paper with MobWrite
Remove tag and date of a paper
Fix Table of contents parser
Change api urls
[fix] Change line event
Create a javascript SyncTex parser
Remove ACE editor/textarea switcher
Improve paper page design
Manage synchronized files

List synchronized file
Add posibility to change the current file (file in edition)
Add possibility to create/remove synchonised file.
Create/remove synchronized file service is based on the mobwrite protocol
Fix cache issues

Some data was never updated in the cache
Add documentation
Improve current line highlighting