Missin __ne__ methods and minor changes
Migrate chords module to chords package
chords.variations module
First chords.finder version

Starting #3
Chord.variation_keys method
ChordFinder class.  Simplified fingerings
Guitar and loog instrument constants
variable fix
Moved penalty funciton  outside Fingering class
Merge branch 'issue-3-chord-finder'

Closes #3