Ajax request to get groups

The get groups function makes an ajax request to /groups to get all the current
groups fo the user. This is to populate the ui form for when adding a new
investment, you can select an existing group.

- Added withRequest flight component to handle ajax requests
- Added sinon for xmlhttp mocking
- Added jasmemine sinon wrapper for expect calls
- Added afterEach and sinon to jshintrc
- Fixed paths in karma conf so they are more specific, less dangerious.

TODO:
- Test the after initialized functionality somehow.
- Adding a new group?