new mic integration

[erikvillegas1]

Added WITMicViewController and supporting files (reachability class, waveform drawing class, WITResponse model object, sounds, and images). Users just need to create a child controller that is of type WITMicViewController and become it's delegate.

Other changes I made to SDK:

• Added code that allows the microphone to cancel the request when no speech is detected.
• Switched timer implementation from CADisplayLink to NSTimer so the mic can detect audio levels when app is in the background
• Modified the AVAudioSession to switch audio routes depending on whether headset was plugged in or not.

[lasryaric]

Hi @erikvillegas1 - I have to work on the SDK and I wanted to start from your pull request since there is many interesting things in it.

The problem is that it does not compile.
Here is a short list of what is missing:

• no #import <UIKit/UIKit.h> in the new files you created.
• @import is not working except if you enable it in the setting ( http://stackoverflow.com/questions/19272683/import-unexpected-in-program )
• WITRemoteControlEventReceivedNotification is not defined

And I found other issue when enabling the debug mode (by adding #define WIT_DEBUG 1).

So it looks like you forgot to push a commit or forgot a few files. Can you please fix it so I can have a look at it and work on top of it?

thanks.