Merge remote-tracking branch 'origin/concurrent-exchanges' into concurrent-exchanges

docs/CNAME

@@ -1 +1 @@
-www.zipline.io
+enigma-catalyst.readthedocs.io

docs/source/conf.py

@@ -1,7 +1,7 @@
 import sys
 import os
 
-from zipline import __version__ as version
+from catalyst import __version__ as version
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the

etc/requirements_docs.txt

@@ -1,3 +1,4 @@
 Sphinx>=1.3.2
 numpydoc>=0.5.0
 sphinx-autobuild==0.6.0
+enigma-catalyst		# readthedocs.org