Fix #164: allow creation of MobileServiceClient with no app key.
Merge pull request #250 from carlosfigueira/Github164

[android] Fix #164: allow creation of MobileServiceClient with no app key.
Use VS2013 auto nuget restore
Remove packages folder as well
[client][js] support for optimistic concurrency on delete
Add back in bcl checks
Merge pull request #251 from hasankhan/jsocdelete

[client][js] support for optimistic concurrency on delete
Merge pull request #252 from phvannor/dev

Use VS2013 auto nuget restore
Merge branch 'dev' into offline
[managed][client][build] Enable auto nuget package restore on SQLiteStore projects
Merge pull request #258 from hasankhan/nugetautorestore

merge dev to offline and enable auto nuget package restore