Added setup.py. Run: python -m wifite

As asked by @blshkv in #102.

Running: `sudo python -m wifite`
Install: `sudo python setup.py install`

These steps (and "uninstalling") are mentioned in the README.

.gitignore

@@ -5,3 +5,7 @@ hs/
 *.bak
 .idea/
 cracked.txt
+MANIFEST
+dist/
+build/
+files.txt