Added (beta) support for sending requests with context

[mm]

Added the ability to pass in (one) state in the context field, as described in the state docs. While this method can still be used to toggle capturing voice intent:

[[Wit sharedInstance] toggleCaptureVoiceIntent:NULL];

This method can also be used, to add the optional state in:

[[Wit sharedInstance] toggleCaptureVoiceIntent:NULL withContext:@"state_name"];

[blandinw]

Thanks @mm! I'm merging that, just a few comments:

• context ≠ state, state is just a part of the context (itself being a dictionary)
• please use the same code style (comments, line length, etc.)

[mm]

No problem! Yeah, at least one of those methods has a giant chain of em in it :laughing: Want me to apply those changes, or are you planning on it?

[blandinw]

I'm planning on it, thanks!