Convert the API URL system from an App based one

to a resource based one.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/rest_api/exceptions.py

@@ -0,0 +1,16 @@
+from __future__ import unicode_literals
+
+
+class APIError(Exception):
+    """
+    Base exception for the API app
+    """
+    pass
+
+
+class APIResourcePatternError(APIError):
+    """
+    Raised when an app tries to override an existing URL regular expression
+    pattern
+    """
+    pass