Fix same location update calls

[yayaa]

To retrieve the location for the first time, library requests location update as minTimeInterval 0 and this might cause some multiple calls for onLocationChanged even though it actually doesn't.

This adapts the logic to remove update request once onLocationChanged is called, and re-schedule with required time & distance intervals if only keepTracking required.

Issue: #64

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@7aa9d85). Click here to learn what that means.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##             master      #65   +/-   ##
=========================================
  Coverage          ?   66.91%           
=========================================
  Files             ?       31           
  Lines             ?     1070           
  Branches          ?       91           
=========================================
  Hits              ?      716           
  Misses            ?      295           
  Partials          ?       59

Impacted Files	Coverage Δ
...yandroid/locationmanager/helper/UpdateRequest.java	0% <0%> (ø)
...ders/locationprovider/DefaultLocationProvider.java	87.5% <100%> (ø)

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