Updated changelog for managed v1.3 release
[client][managed] fixed warnings
[client][managed][offline] config key prefixes should be static
[client][managed][offline] allow underscore and hyphen in queryId
Merge pull request #501 from hasankhan/staticprefix

[client][managed][offline] config key prefixes should be static
Merge pull request #502 from hasankhan/changelog1.3

Updated changelog for managed v1.3 release
Update CHANGELOG.md
Update CHANGELOG.md
Update CHANGELOG.md
Update CHANGELOG.md
[client][managed][offline] Removed PullAsync overloads that do not take queryKey
Merge pull request #503 from hasankhan/removeoverload

[client][managed][offline] Removed PullAsync overloads that do not take queryId
Update CHANGELOG.md
Add doccomments to PullAsync overloads
Merge pull request #506 from lindydonna/dev

Add doccomments to PullAsync overloads
Update Xamarin.iOS quickstart: add offline support, minor UI changes
Updated Xamarin.Android quickstart: add offline support
Windows C# quickstart: add commented-out code for adding offline support
Xamarin Android quickstart: add link to conflict handling tutorial
Xamarin.iOS quickstart: add comment & URL for info on conflict handling