update user model; templates for api; setup user page and github oauth

pypistats/run.py

@@ -1,5 +1,9 @@
 """Run the application."""
+from flask import g
+from flask import session
+
 from pypistats.application import create_app
+from pypistats.models.user import User
 from pypistats.settings import DevConfig
 from pypistats.settings import ProdConfig
 from pypistats.settings import TestConfig
@@ -7,3 +11,11 @@ from pypistats.settings import TestConfig
 
 # change this for migrations
 app = create_app(DevConfig)
+
+
+@app.before_request
+def before_request():
+    """Execute before requests."""
+    g.user = None
+    if "user_id" in session:
+        g.user = User.query.get(session['user_id'])