Adds Area and Distance Utility functions

[shubham1g5]

Adds functionality to calculate area, perimeter and distance for a given set of Mapbox coordinates.

Ported from - https://github.com/googlemaps/android-maps-utils/blob/master/library/src/main/java/com/google/maps/android/SphericalUtil.java

[coveralls]

Pull Request Test Coverage Report for Build 1634

• 41 of 41 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 53.053%

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Totals
Change from base Build 1619:	0.3%
Covered Lines:	3102
Relevant Lines:	5847

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💛 - Coveralls