New app: MultiROM Manager

Add app for MultiROM modification. This modifications implements multiboot for android devices. You can find more info on Google Play or in XDA threads: https://play.google.com/store/apps/details?id=com.tassadar.multirommgr
http://forum.xda-developers.com/google-nexus-5/orig-development/mod-multirom-v24-t2571011

I'm not sure if it is gonna build on your aumated server - it builds on my computer just by using "gradle build" in the root of the repository, so hopefuly it should.