LUN-1643: added categories to list display;
* in order to not affect performance too much, restricted items per page to 50
LUN-1643: current user should be added in the blog allowed users on creation.
* change code style
LUN-1642: a default layout will get generated for a new blog.
LUN-1642: fixed tests since blog creation now requires a home page on the working site.
Category names should be sorted by name
Merge pull request #27 from pbs/LUN-1643

Lun 1643