wp8 unit tests

Made fix to ThenPublishKeyShouldNotBeEmpty test case.
Added code  for auto run of unit tests and logging to Isolated Storage
File.
windows 8 store unit tests

used nunit
windows 8.1 store unit tests

using  nunit
updated unit tests in core
pnsdk param
updated default value for pnsdk param
no slash double encode for pnsdk
added uuid param
copied core file to iis client
copied core file to sl client
copied core file to wp7 client
copied core file to wp8 client
copied core file to wp8.1 client
copied core file to windows 8 store client
copied core file to windows 8.1 store client
Added Json.Net dll reference
Added nunit.framework.dll reference to win 8 store
Added missing ref DLLs for win 8.1 store
WP8.1 unit tests
reference DLLs for WP8.1