adding untracked files

controller/state/file.py

@@ -0,0 +1,27 @@
+import json
+import os.path
+
+
+
+class File(object):
+    "Holds controller state in the file"
+    def __init__(self, filename=None):
+        self.filename = filename
+
+    def present(self):
+        os.path.isfile(self.filename) 
+
+    def load(self):
+        if self.filename is None:
+            raise ClassNotReadyException("Filename not set!")
+        with open(self.filename) as input_file:
+            self.data = json.load(input_file)
+
+    def save(self):
+        if self.filename is None:
+            raise ClassNotReadyException("Filename not set!")
+        if self.data is None:
+            raise ClassNotReadyException("Data not loaded!")
+
+        with open(self.filename, 'w') as out_file:
+            json.dump(self.data, out_file)