Download paper resource

Add a button to download a resource
Add message service

This service is used to diplsay: error/message and warning to the user
Optimise speed transfert of the site
Add autocomplation for reviewer and author name
Add Synctex parser and directive used to display synctex data
Improve paper page design
Add new utilityfunctions

- get absolute position of a block
- convert tex unit to px
[fix] minor bugs
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
[fix] ACE MobWrite client
[add] Synchronize paper with MobWrite
Remove tag and date of a paper
Fix Table of contents parser
Change api urls
[fix] Change line event