Expands ProfileManager and profile unit tests.

Adds methods for deleting, creating, and listing
profiles. Also modifies get_profile by adding
an extra arg to specify whether a non-existing profile 
should be auto-created.

Adds related unit tests to test_profile.

Methods added:
- create_profile
- list_profiles
- delete_profile

Related to https://github.com/Freeseer/freeseer/pull/632
What is `.list()` (or whatever it becomes) returns a collection containing duplicate values? Or things other than 'testing` and 'testing2'?

This should test that it precisely returns `['testing1', 'testing2']`.