clean up some minor details

* Ensure "from future import __absolute__" is included in new files
* Clean up some doc strings
* Remove __ prefix from some internal test methods

.coveragerc

 [run]
 branch = True
-omit = *mock*
+include = eventtracking*

eventtracking/tests/test_track.py

 """
 Test the event tracking module
 """
+from __future__ import absolute_import
 
 from datetime import datetime
 from unittest import TestCase
@@ -28,9 +29,9 @@ class TestTrack(TestCase):  # pylint: disable=missing-docstring
     def test_event_simple_event_without_data(self):
         track.event(sentinel.event_type)
 
-        self.__assert_backend_called_with(sentinel.event_type)
+        self.assert_backend_called_with(sentinel.event_type)
 
-    def __assert_backend_called_with(self, event_type, data=None, backend=None):
+    def assert_backend_called_with(self, event_type, data=None, backend=None):
         """Ensures the backend is called exactly once with the expected data."""
         if not backend:
             backend = self._mock_backend
@@ -51,7 +52,7 @@ class TestTrack(TestCase):  # pylint: disable=missing-docstring
             }
         )
 
-        self.__assert_backend_called_with(
+        self.assert_backend_called_with(
             sentinel.event_type,
             {
                 sentinel.key: sentinel.value
@@ -64,8 +65,8 @@ class TestTrack(TestCase):  # pylint: disable=missing-docstring
         try:
             track.event(sentinel.event_type)
 
-            self.__assert_backend_called_with(sentinel.event_type)
-            self.__assert_backend_called_with(
+            self.assert_backend_called_with(sentinel.event_type)
+            self.assert_backend_called_with(
                 sentinel.event_type, backend=another_backend)
         finally:
             track.BACKENDS.remove(another_backend)
@@ -78,7 +79,7 @@ class TestTrack(TestCase):  # pylint: disable=missing-docstring
         try:
             track.event(sentinel.event_type)
 
-            self.__assert_backend_called_with(
+            self.assert_backend_called_with(
                 sentinel.event_type, backend=another_backend)
         finally:
             track.BACKENDS.remove(another_backend)

eventtracking/track.py

@@ -13,6 +13,8 @@ Best Practices:
     equivalent to another, say so in your documenation, and the analyst
     can decide whether or not to group them.
 """
+from __future__ import absolute_import
+
 from datetime import datetime
 import logging
 
@@ -25,8 +27,9 @@ def event(event_type, data=None):
     """
     Emit an event annotated with the UTC time when this function was called.
 
-    :event_type: A unique identification string for an event that has already been registered.
-    :data: A dictionary mapping field names to the value to include in the event.  Note that all values provided must be serializable.
+    `event_type` is a unique identification string for an event that has already been registered.
+    `data` is a dictionary mapping field names to the value to include in the event.
+        Note that all values provided must be serializable.
 
     """
     full_event = {