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Add location watcher plugin for WPF.
Fix incorrect unsubscribe on Dispose

was subscribed to Click but unsubscribing from LongClick
Added AsyncRequestHandle class, to support request cancel in future.
Fix #638 - Mac Binding build is failing.
Change fields case to _lowerCamelCase to make them (more) consistent with the rest.
Merge pull request #639 from ashokgelal/fix_#638

Fix Mac Binding build is failing
Merge pull request #633 from rb1234/v3.1

Fix incorrect unsubscribe on Dispose
Fix null exception after Windows Phone location watcher stop
Merge pull request #641 from kohlerb/v3.1

Fix null exception after Windows Phone location watcher stop
stream usings in windows store - fixes #638
Merge branch 'v3.1' of github.com:slodge/MvvmCross into v3.1
Merge pull request #634 from wedkarz/v3.1

Add AsyncRequestHandle class, to support request cancel in future.
Follow up to #634
Better Apache 2.0 credit
Merge pull request #632 from AlanYost/v3.1

Add location watcher plugin for WPF.
stop fixes for #632
Removed non-IDisposable Dispose from #632 - shouldn't really use Dispose outside of IDisposable and this public method would have been hard to locate/use from client code (especially shared PCL code)
Build and nuspec fixes for #632
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