* Install rsf.py

* Add an __init__.py in routersploit/resources

Previously, without it, routersploit/resources/wordlists code were not properly
picked up by setup.py.

* Add a MANIFEST.in in order to install all needed package files

Previously package files in resources subdirectories (i.e. ssh_keys, vendors
and wordlists) were not installed as part of setup.py.