Fix warnings.
Merge branch 'unstable' into feature-requirements
Some code to handle requirements.
Made requirements working for most sensors.

Still need to merge requirements for motion sensors.
Add time sensor.
Added reset settings for testing purposes.
Hack for burst sensors in requirements.
Small fixes for brightr.

- check for nil on login
- send non-string sensor values (ugly, should be improved but works for now)
- location sensor doesn't block the main thread in cases such as the testcase
Fix threading issues for requirements and settings.
Instantiate sensors on main thread.
Add application key and authenticate using new authentication server.
Improvee Disable requirements.
Request permission for location services, as required for iOS8.
	test
Fix requirements handling for motion sample interval.
Fixes.

- Possible race condition
- let noise use the requirements for the screen sensor.
Added synchronization blocks in CSSettings.
Enable compression again.
Update to live urls.
Merge pull request #40 from senseobservationsystems/feature-live_urls

Update to live urls.
Implemented time_zone sensor.