Add script to build and run Phoenix

Script `src/makeandrun.sh` (re)builds phoenix, then runs it with bochs.
Add argument to `find -exec` statements.

Pass a new argument to the sub-shells launched by `find`. This is necessary
because some shells treat their first argument specially. See:
http://mywiki.wooledge.org/UsingFind#Complex_actions

Make comments more succinct and apropos.
Merge pull request #3 from Ichimonji10/makeandrun

build script