Adds ability to have multiple listeners on location clients

[coveralls]

Pull Request Test Coverage Report for Build 1638

• 21 of 31 (67.74%) changed or added relevant lines in 4 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.04%) to 53.097%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
library/src/main/java/io/ona/kujaku/location/clients/BaseLocationClient.java	13	14	92.86%
library/src/main/java/io/ona/kujaku/views/KujakuMapView.java	0	4	0.0%
library/src/main/java/io/ona/kujaku/location/clients/GoogleLocationClient.java	2	7	28.57%
<!--	Total:	21	31	67.74%	-->

Files with Coverage Reduction	New Missed Lines	%
library/src/main/java/io/ona/kujaku/location/clients/GoogleLocationClient.java	1	34.69%
library/src/main/java/io/ona/kujaku/views/KujakuMapView.java	1	23.85%
<!--	Total:	2		-->

Totals
Change from base Build 1635:	0.04%
Covered Lines:	3112
Relevant Lines:	5861

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💛 - Coveralls