Added an example config file to store 'username' key in for automated tests.
Update to .gitignore.
Moved FileExists function into util module. Also fixed key module to use json.
Updated .gitignore.
Added LICENSE file.
Removed an the old hued-web example web application. Retro-fitted examples/get-light-state.go to read in config via CLI option.
Updated Makefile and updated groups_test.go with some more distinguishing colors.