Bug fixes and feature adds

[zass30]

Fixes issues:

• Notes always display as 4th octave regardless of note pressed #4
• Incorrect note display when chords pressed in key of F minor #5
• Edge keys won't light up after move button pressed #9

Adds features:

• Add sharps/flats toggle

[flipcoder]

Thanks for the help while I was absent from the project. I'm in the process of merging these in with my local changes on dev2 and I'll do a new release shortly once I finish testing.