Documentation; include expression & preferences

src/opsoro/expression.py

@@ -1,3 +1,12 @@
+"""
+This module defines the interface for communicating with the expression.
+
+.. autoclass:: _Expression
+   :members:
+   :undoc-members:
+   :show-inheritance:
+"""
+
 from __future__ import with_statement
 
 import math

src/opsoro/preferences.py

@@ -1,3 +1,12 @@
+"""
+This module defines the interface for communicating with the settings of the robot.
+
+.. autoclass:: _Preferences
+   :members:
+   :undoc-members:
+   :show-inheritance:
+"""
+
 from __future__ import division
 from __future__ import with_statement
 

src/opsoro/sound/tts.py

@@ -18,6 +18,9 @@
 
 class _TTS(object):
     def __init__(self):
+        """
+        TTS class, used to convert text to speech.
+        """
         self.engine = "espeak"  # "espeak"
         self.language = "nl"
         self.gender = "f"  # "m"