New build script and readme, merging in paranoid repo

    * aosp, aospa, cm and jellybeer roms support
    * enhanced ccache support (requires trivial patch for build project)
    * automatic prebuilts fetching (optional)
    * interactive shell
    * automatic jdk selection and openjdk workaround
    * cosmetic improvements
    * support for extra CM packages
    * support for non-OTA builds

For more details review README.md

Change-Id: Iddcd96787945058e58317bad9a988994381b20e8