Updating roles and groups available in the app.
Gave dates to old delivery files.
Proof-reading: deleted empty files.
Proof-reading: minor adjustments and corrections.
Proof-reading: dates and project history.
Merge branch 'master' into dates-on-deliveries

Conflicts:
	entregables/site/Docs/Manual-de-Usuario/Administracion-de-almuerzos.markdown
	entregables/site/Docs/Manual-de-Usuario/Administracion/Migraciones.markdown
Added links to administrative sections of the user manual.
Merge pull request #329 from AlphaGit/dates-on-deliveries

Dates on deliveries and proof-reading on project documentation