Show sample filter cases on a map

[ekigamba]

This also enables fabric crashlytics for debug

Crashlytics is enabled for debug because we mainly provide the debug APK this being a sample application and not necessarily one to put on the store.

All the code is also open source

Fixes #289

[coveralls]

Pull Request Test Coverage Report for Build 1347

• 1 of 38 (2.63%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+8.3%) to 36.928%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
sample/src/main/java/io/ona/kujaku/sample/activities/CaseRelationshipActivity.java	0	37	0.0%

Files with Coverage Reduction	New Missed Lines	%
sample/src/main/java/io/ona/kujaku/sample/activities/CaseRelationshipActivity.java	1	0.0%

Totals
Change from base Build 1343:	8.3%
Covered Lines:	2161
Relevant Lines:	5852

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💛 - Coveralls

[githengi]

Am getting NPE on
sampleCasesSource.setGeoJson(boundaryFeatureCollection2);
Stack trace
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.mapbox.mapboxsdk.style.sources.GeoJsonSource.setGeoJson(com.mapbox.geojson.FeatureCollection)' on a null object reference
at io.ona.kujaku.sample.activities.CaseRelationshipActivity$3.onClick(CaseRelationshipActivity.java:130)