NetworkConnector no longer waits 10 minutes before failing

Reduced the number of attempts from 10 to 5.

Because of the exponential backoff, the sixth attempt starts one minute after the first attempt and the tenth starts closer to ten minutes after.

If a call hasn't connected after a minute (5 attempts), it's reasonable to propagate failure to the user.
Waiting 17 minutes (10 attempts) is a bit much.
Most are unlikely to wait 20 seconds.

(An alternative change would be to lower the backoff factor.)
Updated language translations
Bump version to 0.9.2
Support key continuity features of ZRTP.

1) Add verification button to SAS UI.

2) Support the retained secret stuff from ZRTP.

3) Add a few additional visual indicators to denominate the in-call
   screen as belonging to RedPhone.
Updated language translations
Rename polish strings.
Bumped version to 0.9.3
Support for voice call verifications.

If the registration process times out while waiting for a
verification SMS, it now offers the ability to fallback
to an incoming voice call for verification instead.
respond to soa comments
Call metrics collection, reporting,
interface, and preferences.
merge conflict
Merge pull request #158 from WhisperSystems/voice_verification

Support for voice call verifications.
Add support for selecting a bluetooth headset to the in-call screen
enforce metrics opt-out inside monitor data collector
Merge pull request #169 from WhisperSystems/metrics_policy_fix

enforce metrics opt-out inside monitor data collector
Switch popup menu to use ABS, support pre-Honeycomb Bluetooth
Merge remote-tracking branch 'origin/master' into bluetooth_ui
cancel first notification if user declines to provide feedback
Merge pull request #173 from WhisperSystems/callmetrics_ui_fix

cancel first notification if user declines to provide feedback
Fix NPE