Allow to select where to save log files

Also did some pep-8 fixes.

Signed-off-by: Daniel Francis <francis@sugarlabs.org>
Make development shell more easy to use

* Move shell command to pyrp-shell.
* Add information to the README.

Signed-off-by: Daniel Francis <francis@sugarlabs.org>
Merge branch 'master' of github.com:sdanielf/pyrp