Use explicit relative imports
Throw exception if unknown param given with find() functions
Remove Project.blob() function (use Project.get_blob() instead)

Limiting functions without "get_" to those passing either no args
or just the key of the object to get
Fix commits(), potential inf loop in find(), and consolidate list code further
Return None instead of empty list from find fns if not find_all=True
Accept optional params even if not named in add() functions

Argument handling for add() functions now behaves like it should and
is expected of all python functions.
Consolidate request code
Add conversion of date strings to datetime objects

Toggleable via 'convert_dates' named param to GitLab's init function.
Default is on.
Bump version to 0.3
Update docs
Tweak README
Remove bugtrack_url from setup, bump version