Enable the new read the docs theme, it's pretty.

Refs: https://twitter.com/readthedocs/status/392794577918099456
diff --git a/docs/conf.py b/docs/conf.py
index 16b1109..a368ac7 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -248,3 +248,7 @@
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {'http://docs.python.org/': None}
+
+
+# Enable the new ReadTheDocs theme
+RTD_NEW_THEME = True