Redirection.
Redirection to the last visited page.
Adding redirect option to parameters.yml.
Merge branch 'master' of github.com:claroline/CoreBundle into workspace-redirection

Conflicts:
	Controller/Administration/ParametersController.php
	Form/Administration/GeneralType.php
	Library/Configuration/PlatformConfiguration.php
	Library/Configuration/PlatformConfigurationHandler.php
Redirection after login.
Merge pull request #340 from ngodfraind/workspace-redirection

Workspace redirection