Add ro.cm.version to build.prop (necessary for sdcard installer)

I am not happy about this either, but that script has been in use for
almost three years. The user base is not upgrading it just because I don't
want hacky code.

Change-Id: I110fe7c7106f19e488867d788609eb73440abe85
Use the XHDPI boot animation

The users deserve an actual PA animation, don't you think?

Change-Id: Ief28f84d8df2b9755cbfa844102183ac8f09c816