Fixed issue #139.

Testing has been completed on outgoing calls only. It is recommended that testing is conducted on incoming calls before a commit to upstream.
Fixing singleton initialization

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More advanced fixes for push notifications on iOS7
Updating Pods & translations for release

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Closes #181

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Bump up version number of release.
Vibrations and minor fix in audio interrupts
Merge pull request #187 from WhisperSystems/gavia-master

Merging fixes for audio interrupts and vibration while ringing.