Use RTD theme locally

Author: kurtisnelson

.gitignore

@@ -0,0 +1,2 @@
+_build
+html

conf.py

@@ -11,6 +11,13 @@
 
 import sys, os
 
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+
+if not on_rtd:  # only import and set the theme if we're building docs locally
+    import sphinx_rtd_theme
+    html_theme = 'sphinx_rtd_theme'
+    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
 # -- General configuration -----------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be extensions