fix click start not work on wp8 change start-->startApp,

http://stackoverflow.com/questions/17149372/error-function-expected-in-ie-input-onclick-start
[wp8]fixed wp appsendMessage not work!

1. wp use  special app.js to define appsendMessage
2.change plugin.xml

3.http://twiki.polyvi.com/twiki5/bin/view/Dev/ProjApolloWP8AppSendMessage