Code adapted for 2.3 release
Compare using interface
Merge pull request #1 from robjperez/use_stream_comparable_interface

Compare using interface
Merge branch 'develop' of https://github.com/opentok/opentok-android-sdk-samples into update_2.3
Merge pull request #20 from marinaserranomontes/update_2.3

Update 2.3
Adding license file
Merge pull request #21 from marinaserranomontes/update_2.3

Adding license file
Adding backPressed in Voice Activity
Merge pull request #22 from marinaserranomontes/fix_voice_only

Adding backPressed in Voice Activity
Fix readme
Adding x86 references
Merge pull request #23 from marinaserranomontes/fix_README

Fix readme
Fixing audio_mode: harware volume control