udpated version strings to 0.2.2-dev
changing clipping toward fixing #81
Added normalization option to write_wav()
Merge pull request #82 from drepetto/master

Added normalization option to write_wav()
Unbroke normalize option

Needed an else statement so that wav would be valid data if not
normalizing.
Merge pull request #83 from drepetto/master

Unbroke normalize option
Onset detection example
Merging