use PNGs intead of MathJax

docs/source/conf.py

@@ -54,7 +54,8 @@ extensions = [
     'sphinx.ext.napoleon',
  #   'sphinx.ext.coverage',
  #   'sphinx.ext.todo',
-    'sphinx.ext.mathjax',
+ #   'sphinx.ext.mathjax',
+    'sphinx.ext.imgmath',
     'sphinx.ext.viewcode'
 ]
 
@@ -82,9 +83,9 @@ author = u'Theo Steininger / Martin Reinecke'
 # built documents.
 #
 # The short X.Y version.
-version = u'4.0'
+version = u'5.0'
 # The full version, including alpha/beta/rc tags.
-release = u'4.0.0'
+release = u'5.0.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.