Add minimal space management (get/create/delete).

Create and delete are restricted to current organization retrieved by
current space.
Space creation only support required parameters.
Get is not restricted.


This could be part of story Add APIsfor managing
spaces[https://www.pivotaltracker.com/story/show/53169449]
Merge pull request #238 from Orange-OpenSource/master

Add minimal space management (get/create/delete).