Update avatar upload

- Users the new avatar upload url
- Adds tests that were pending for avatar upload
- Cleans up use of the params method in groups and categories
- Version bump

This commit depends on [discourse/discourse #3024](https://github.com/discourse/discourse/pull/3024)
Merge pull request #53 from oblakeerickson/avatar

Update avatar upload
Add test for activating a user.

- Check that the correct request type is sent
- Check that a json success is returned
- Created a fixture

This commit depends on [discourse/discourse #3031](https://github.com/discourse/discourse/pull/3031).
Merge pull request #54 from oblakeerickson/activate

Add test for activating a user.
Merge branch 'master' into wikify-post

Conflicts:
	lib/discourse_api/api/categories.rb