Merge pull request #333 from ycombinator/working

Adding test to try and delete non-empty container.
Proposal to fix the user creation issue with OpenStack
Fix comments
Add $alias parameter to the Base object as it is used in the populare method
Simpler alias resolving
Fix code styles according to PSR2
Add somes spaces or lines and remove use statements of unused classes
Merge pull request #342 from benja-M-1/psr

Psr code styles
Merge pull request #341 from benja-M-1/hotfix/user-creation

Proposal to fix the user creation issue with OpenStack