Fix template bibliography stub

The default line to include bibliography must be correct to avoid making
people think it does not work with BibTeX.
Merge branch 'fix/default-template-bibliography' of github.com:satabin/bluelatex into satabin-fix/default-template-bibliography
Merge branch 'satabin-fix/default-template-bibliography'
Improve the French translation
[fix #127] Improve English translation
Informs user that password is sent by email.

Add a message before registration to inform user that password is sent
by email.
Merge pull request #129 from tdurieux/translation-improve

Improve French and English translation
Merge pull request #130 from tdurieux/mailbox-check-registration

Informs user that password is sent by email.
Ask a confirmation before removing files and resources

A confirmation popup asking the user to confirm the deletion of files
and resources.
Merge pull request #132 from tdurieux/confirm_before_remove

Ask a confirmation before removing files and resources
Bump sohva version
Make lift-json version OSGi friendly again

OSGi bundles require to have a version number following a strict scheme
which lift-json doesn't have.

I know I'm guilty about having pushed this without checking this part,
and I am very sorry for that. It will never happen again... Or maybe it
will, but bumping version shouldn't lead to this, if we only use OSGi
friendly libraries, which is something we are going towards.
Handle correctly conflicts

In sohva 1.0.0, the `ConflictException` is not wrapped in a
`SohvaException` anymore.
Include maintenance branch in travis CI
Migrate common component to spray

This is the first big step of migration to spray server. The common
bundle entirely relies on spray and not on tiscaf anymore.
The class hierarchy was pretty much simplified for the Rest API, there
is no split between synchronous/asynchronous or
standard/authenticated/role HLet.

The interface to CouchDB was also cleaned up and is available to any
person extending the Rest API.
Migrate core module to spray
More work for the core component
Migrate compiler module to spray
Migrate the synchronization module to spray
Migrate web client to spray