Mejorando sistema de autenticación.
Merge branch 'development' of github.com:HuntingBears/tribus into development

Conflicts:
	docs/reusar
	tribus/web/auth/ldap/backend.py
	tribus/web/auth/ldap/config.py
	tribus/web/auth/views.py
	tribus/web/settings.py
	tribus/web/views.py