Authored by Justin R. Miller

updated changelog for 1.6.1

Changelog
---------
### 1.6.1
#### April 25, 2015
- Allow requirement for iOS 8 location services to be satisified both "always" and "when in use" modes.
- Fixed a bug when checking the types of tile sources that can be taken offline.
- Better developer warnings around when a Mapbox access token is required.
- Fixed a visual glitch with the user location dot.
- Improvements and fixes to CocoaPods installation method.
### 1.6.0
#### February 4, 2015
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