JRE installer needs to be FX2 aware when registering/unregistering deployment bits

Starting in JRE 7, deployment bits will have it's own versioing scheme (10.x.x). The JRE installer needs to be aware of this when doing registering/unregistering deployment bits - it cannot depend only by the JRE versioning anymore.

e.g install JRE 7, install FX2, uninstall JRE 7, re-install JRE 7.

JRE 7 has deploy 10.0.0
FX2 has deploy 10.0.1

at the end of the above sequence, the plugin/webstart that is registered as default should be from FX2 (10.0.1).