Adds option to show the OS calibration screen for compass updates.
Merge pull request #404 from rromanchuk/regression/fix-ios8-location

fix broken location due to ios8 location authorzation api changes
Merge pull request #405 from rubymotion/compass-calibration

Adds option to show the OS calibration screen for compass updates.
release v1.7.1
Update README.md
Add in exploratory deferrable delegates for easily passing on callbacks and chaining them together
Change method names
Rename methods again. Add in spec covering deferrable functionality
Update documentation. Change deferrable delegates to return self for easy chaining
Merge pull request #407 from jonmorehouse/deferrable-delegate

Add in exploratory deferrable delegates for easily passing on callbacks and chaining them together
Merge remote-tracking branch 'upstream/master'