Release v0.6.0

Changelog

API changes

• Moved to WebRTC branch 4692 (M97) (29a6e3b)

Enhancement

• Lazy-load audio/video managers #44 (674b6af)
• Get default audio devices #50 (a630f28)

Fixed bugs

• Fixed AudioProcessing native ProcessReverseStream function call #46 (e912543)
• Fixed loading classes from native threads with detached class-loaders #49 (e50249b)
• Fixed camera device selection for a video track on Unix systems #30 (8b0fb4f)