Added Windows Store Client Sample
Merge branch 'master' of https://github.com/Redth/PushSharp

# By Joe Lutz (1) and Maor Hayun (1)
# Via Jon (2) and Maor Hayun (1)
* 'master' of https://github.com/Redth/PushSharp:
  typo fix at AdmPushBrokerExtensions
  Fixed minor copy/paste oversights in AdmPushBrokerExtensions.