Add: Full Voice Activity Detection

- print error message from the exeception in WitRequestTaskSpeech
Fix: audiorecorder buffer overflow,

Fix: past buffers all nulls
Using the Wit.ai API version 20140923
Add: support for context
Add: support for custom message ID through IWITListener
Removing useless imports
Merge branch 'master' into fullvad

* master:
  Changing minor version in order to link to the right docs
  Add: link to 2.0.1 documentation
Adding comments for the public API
Changing readme to 3.0.0
Merge pull request #8 from wit-ai/fullvad

Add: Full Voice Activity Detection