Initial commit for v1.0 using mitmproxy instead of twisted

Added a plugin system to Net-Creds so you can now add your own parsers,
api hook names might change between now and the offcial release
(will submit a PR to the original repo once completed)

The main MITM HTTP Proxy now uses mitmproxy which is a big deal, cuts
the code down by an insane amount, no more twisted! yay!

Basic plugin have been re-wrote for the new proxy engine

Since we are using mitmproxy we have out of the box support for SSL/TLS!

plugins/plugin.py

@@ -0,0 +1,45 @@
+'''
+The base plugin class. This shows the various methods that
+can get called during the MITM attack.
+'''
+import argparse
+import logging
+
+class Plugin(object):
+    name    = "Example Plugin"
+    optname = "example"
+    desc    = ""
+    version = "0.0"
+
+    def __init__(self, parser=None):
+        '''Optionally Passed the options namespace'''
+        if parser:
+            if self.desc:
+                sgroup = parser.add_argument_group(self.name, self.desc)
+            else:
+                sgroup = parser.add_argument_group(self.name,'Options for the {} plugin'.format(self.name))
+
+            sgroup.add_argument('--{}'.format(self.optname), action='store_true',help='Load plugin {}'.format(self.name))
+
+            self.options(sgroup)
+
+    def initialize(self, context):
+        '''Called when plugin is started'''
+        pass
+
+    def shutdown(self, context):
+        '''This will be called when shutting down'''
+        pass
+
+    def request(self, context, flow):
+        pass
+
+    def responseheaders(self, context, flow):
+        pass
+
+    def response(self, context, flow):
+        pass
+
+    def options(self, options):
+        '''Add your options to the options parser'''
+        pass