Fix startup script for general usage

The install script will, in this commit, copy the startup script to the
default location of /etc/init.d/grove, so that it can be invoked with
'service grove <command>'.

- close #16
Cleaned up install script (with option changes)

The install script is now invoked either as './install.sh --build' (or
'-b') to invoke the compiler, or './install.sh' to skip that step
entirely.

This commit will also clean up the output somewhat, and make it more
readable.
Fix small scoping problem with the status variable