build_scripts: build.sh

Simple build script that does the following:

- Asks what ROM to build (modify this to fit your setup)
- Asks what device to build (same entry as "brunch" command)
- Asks if make clean should be run
- Asks if the repo should be synced
- Sets a "build prefix" variable so only the ROM zip and md5sum are uploaded
- Uses scp to push the ROM zip and md5zum to a specified location
- Swears at you quite a bit