updates color generation, tries fixing credentials bug

- credentials still lost the refresh token after a certain event
  - this was now fixed by completely removing any saves past the first one
  - https://trello.com/c/iORYLYHl/44-1-check-on-credentials

- Color Coding is now updated
  - fixed an incorrect color mapping in the colors.json
  - updates some calls to functions to correctly get the natural colors
  - the incorrect red -> yellow mapping might have to do with the previous credentials error

server/routes.py

@@ -116,7 +116,9 @@ def callback():
     print("login:" + user.id)
 
     login_user(user)
-    user.setGoogleCredentials(credentials)
+    # TODO currently not using the credentials anymore
+    if user.getGoogleCredentials() is None:
+        user.setGoogleCredentials(credentials)
     return flask.redirect(flask.url_for('index'))
 
 @app.route("/logout")