echo cancellation: ui, calibration, visualization
Merge branch 'master' of git://github.com/worklist/hifi into 19371
libspeexdsp-based echo cancellation (untested)
implements audio echo cancellation based on speex
Merge branch 'master' of git://github.com/worklist/hifi into 19371
comments unused variable to avoid a compiler warning
Occlusion culling optimizations, added minimum polygon area, and only calculate projection matrix once
naming cleanup and some optimizations
Convert frame to grayscale and equalize.
separates echo cancellation from loopback test (intermediate commit)
added copyright message
- separates audio system round trip time determination from echo cancellation
- changes speex parameters to more humble values
- resolves build issues by removing the speex dylibs - static ones are fine
- tightens build script
implement partitioned CoverageRegions in CoverageMap to further optimize polygon compares
Basic Haar cascade/CamShift tracking.
adds 'Oscilloscope::setColor' and uses it when visualizing echo cancellation
Merge branch 'master' of git://github.com/worklist/hifi into 19371

Conflicts:
	interface/CMakeLists.txt
Merge pull request #560 from ZappoMan/occlusion_culling

Occlusion culling optimizations
Merge pull request #565 from tschw/19371

Code Review for Job #19371
Merge branch 'master' of https://github.com/worklist/hifi into opencv
Reset webcam along with other sensors on spacebar, added settings config for
non-Apple.