Documentation, code-formatting, and refactoring.

* Added some docs, updated existing docs.
* Use single-quotes for strings when possible.
* Color.pexception() prints exception and stack trace.

wifite/model/attack.py

@@ -12,7 +12,7 @@ class Attack(object):
         self.target = target
 
     def run(self):
-        raise Exception("Unimplemented method: run")
+        raise Exception('Unimplemented method: run')
 
     def wait_for_target(self, airodump):
         '''Waits for target to appear in airodump.'''