Merge pull request #1 from katspaugh/master

Update
Update drawer.canvas.js

If waveColor and progressColor are identical you can still see some differences in the waveform when jumping around (positioning the playhead).
Anyway in this case there is no need for progressCc.
Update wavesurfer.timeline.js

Optimize notch interval
Merge pull request #303 from binron/master

Disable progressCc if waveColor == progressColor