Improve infrastructure

- Adding a Makefile to centralize all the steps.
- Adding badges with current status.

You can check the README output here: https://github.com/magmax/python-repoman/tree/improve-infrastructure
Removing the dist and build directories it is not necessary to execute an "env_setup_for_development" target, but removing the .egg-info it is.

What do you think? Should we remove the "dist" and "build" directories in the "clean" target and remove the ".egg-info" directories in the "vclean"?