Introduce new flask based python backend

This supports most functionality. Tested the following functionality:
* Create account
* Delete account
* Create a card
* Download offline copy (couldn't log in) - needs work
* Change passphrase
* One time password creation and use

scripts/builder/backends/flaskBuilder.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+# -*- coding: UTF-8 -*-
+
+import os
+import shutil
+from scriptLanguageBuilder import ScriptLanguageBuilder
+
+
+class FlaskBuilder(ScriptLanguageBuilder):
+
+    def name(self):
+        return "Flask builder"
+
+    def relativePath(self):
+        return 'flask'
+
+    def createPackage(self):
+        super(FlaskBuilder, self).createPackage()