cordova run wp8 freezes after application starts and until app is closed.

Repro steps:
1. create new cordova app
2. add wp8 platform to app created
3. start application from CLI (cordova emulate/run)

On all platforms except wp8 this causes application to start in emulator/device and then then deploy script exits.
On wp8 deploy script freezes, until application is closed, and only then exit.

This is inconsistent across platforms and may be confusing to developers.

This is because of CB-802, which is still not resolved.

I propose to hide this behaviour behind '--wait' flag of Cordova Deploy, and make this behaviour default when all (or most important) platform will support it.