Generalize github_issues module

It can house anything related to GitHub.
For now, that's only GitHub Issues material.
But other classes may be added later, who knows.

Author: ctrueden

github_issues.py github.pygithub_issues.py renamed to github.py

@@ -4,9 +4,9 @@
 # See the UNLICENSE file for details.
 #
 # ------------------------------------------------------------------------
-# github_issues.py
+# github.py
 # ------------------------------------------------------------------------
-# A class to download and organize issues from GitHub.
+# A class to download and organize information from GitHub.
 
 import json, logging, math
 import requests