move all code into peep/peep.py, to enable standalone executable
add __main__ to let peep.py be invoked directly
Switch to a simple module rather than a package. Bump version to 0.9.

Add a shebang line for convenience of embedding on UNIX-alikes. Make peep.py executable.
Make peep easier to embed in other projects. Close #20.
Merge pull request #1 from erikrose/master

latest from upstream