CB-7616 partial match support for --target

This change allows using partial string when specifying target device/emulator via --target param, for example
<code>
cordova run wp8 --target="WVGA" -- --phone
</code>

Example device list for Windows is listed below:
Device
Emulator WVGA 512MB
Emulator WVGA
Emulator WXGA
Emulator 720P
Emulator 7.1 256MB
Emulator 7.1