Add Tag attribute when recording locations

[eotin]

• Create a new object tlocation derived from location with an extra long integer field named “tag”
• When calling start recording, add an optional param called “tag”. If not provided. Value is 0. The tag value is persisted so that it can be added to each location updates systematically.
• Add also this param when forcing the recording of a point. This param is optional. If not passed, the current persisted tag value is used. If passed, it is used for the forced location only but DO NOT change the default one used for subsequent location updates.
• Add a method setTag to change the persisted tag at any time. It will be used at each subsequent location updates.
• Return a collection of tlocations instead of locations

[coveralls]

Pull Request Test Coverage Report for Build 1501

• 113 of 127 (88.98%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.6%) to 52.675%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
library/src/main/java/io/ona/kujaku/services/TrackingService.java	72	76	94.74%
library/src/main/java/io/ona/kujaku/views/KujakuMapView.java	0	10	0.0%
<!--	Total:	113	127	88.98%	-->

Totals
Change from base Build 1497:	0.6%
Covered Lines:	2855
Relevant Lines:	5420

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💛 - Coveralls