Add RememberMe support to AuthService Authenticate API method

The Post method of the auth. service supports persisting the users RememberMe preference for sessions (ss-opt cookie).  The public API method "Authenticate" looks like it should also support this to enable persistent sessions.
Fix PCL build errors and add new PclTest.Android project
Change HandleCallbackOnUIThread to delegate to PclExportClient so can work in all platfroms
Add manual Configure() and RunOnUiThread support on all platforms
don't try to infer pcl provider platform as it throws a static initializer exception
Pcl tweaks
Add PclTest.Android project to call ServiceStack services from an Android PCL test client
Add task extensions to make the callsite DRY-er
Refactor ServiceStack.Pcl solution, add PclTest.WinStore project
PCL tweaks, fix WinStore bug using IsDefined
Add PclTest.Wpf project using PCL libs
Add SS.Client PCL dll
Added PclTest.Ios project
Update latest dlls and add PclTest.Ios to ServiceStack.Pcl.sln
Update SS dlls
Buffer SOAP Requests by default
Change HttpListenerBase to log original exception wtih message
Fix NRE, don't run on UI Thread if not Configured
Add Html/Url Encode/Decode to PclClientExport
Add Configure to PclExportClient.SL5