[iOS] Fix issue with exposing version via header

Fix issue where the version column was exposed to the caller when not
asked for, when it came from the ETag header
[iOS] update stag used in test
Merge pull request #353 from phvannor/dev

[iOS] Fix issue with exposing version via header
[client][managed] Send datetimeoffset token in odata query if datetimeoffset type is used
Merge branch 'dev' into offline

Conflicts:
	sdk/Managed/src/Microsoft.WindowsAzure.MobileServices/Table/Query/Linq/FilterBuildingExpressionVisitor.cs
	sdk/Managed/test/Microsoft.WindowsAzure.Mobile.Net45.Vb.Test/QueryTests.vb
	sdk/Managed/test/Microsoft.WindowsAzure.MobileServices.Test/FunctionalTests/DateTests.cs
	sdk/Managed/test/Microsoft.WindowsAzure.MobileServices.Test/UnitTests/Table/Query/ZumoQuery.Test.cs