Added Vocal/Instrument track recording feature!

You can now record a full length vocal or instrument track, allowing you to freestyle along with the beat and record that, or to play an instrument if you wish. Recording is done through the device Microphone.
It's recommended to wear headphones while recording so you don't re-record the beat itself (feedback)
On my Galaxy Nexus I had trouble when trying to use iRig Mic or the iRig Cast, I seemed to get "bleed through". I think that is a hardware problem and not an issue with Electrum. If you use the default MIC everything works great.
Changes:
Fixed help HTML dialog not displaying properly on some devices
Fixed PAD recording , was broken on some devices
A few other small bug fixes.
Please email me with any issues regarding Vocal track record! Also, vocal recording only plays the current pattern. Let me know if you want it to play the song sequencer instead!
-nikotwenty