Replace exclude_trees with exclude_patterns

exclude_trees was removed in Sphinx 1.3b1

doc/conf.py

@@ -83,9 +83,7 @@ release = version
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-#exclude_patterns = []
-
-exclude_trees = ['sphinx-bootstrap-theme']
+exclude_patterns = ['sphinx-bootstrap-theme/*']
 
 # The reST default role (used for this markup: `text`) to use for all documents.
 #default_role = None