error messages returned by search, read_tag, and write_tag are not exceptions
organize puts error messages returned by update
Merge branch 'master' of https://github.com/jwhitis/AudioFile into refactor

updates README
creates several helper methods for Gracenote class
error messages are stored in metadata hash
creates several helper methods for Track class
adds more helper methods to Track class
creates several helper methods for Collection class
reorganizes Track class
adds test support for Colorize module
moves user creation from api to execute
fixes bug in process_entry
incorporates Database Cleaner into tests
fixes bug in process_entry test
Merge pull request #1 from jwhitis/refactor

Refactor