Devel version bump.
Added a --root option to `tower-cli group list`.
Make job template look up by int or name.
Inventory source creation and updating.

Initial pass at #9.
Currently lacks tests.
Better inventory source approach.
Unit tests for prior commit.
Merge branch 'master' into issue-9-unstable

Conflicts:
	lib/tower_cli/models/base.py
	lib/tower_cli/resources/group.py
	tests/test_resources_group.py
Merge pull request #9 from ansible/issue-9-unstable

Add support for Group inventory sources