New methods to parse tab, tuning and chord name

This release adds the following features:

• New parseTuning method to break a string into notes (e.g. EADGBE becomes ["E", "A", "D", "G", "B", "E"]
• New parseTab method to break a string into frets (e.g. X32010 becomes ["x", 3, 2, 0, 1, 0]
• New parseChord method to break a string into a chord root and quality (e.g. Csus4 becomes ["C", "sus4"]
• New notes constant containing the list of all 12 notes.
• New tuning constant containing a list of common tunings.

Check the new Documentation to learn more about those new features.