Add Apache License.
Merge pull request #21 from nchammas/master

[#17] give the various tabs anchor tags
Add user overview pages; improve templates.

These user overview page shows open PRs authored by the user, plus any
open PRs that they have commented on (excluding Jenkins-only comments).

This patch also improves the templates by extracting reusable code into
Jinja macros.
Enable sign-in using GitHub OAuth API.
Add test with Jenkins button; primitive ACLs.
Let /trigger-jenkins accept GET requests;

This is useful for @davies's bookmarklet.
Display total number of open PRs in nav bar.
Add "Fork me on GitHub" button; larger login button.
HTML refactoring; split CSS and JS into separate files.

The APP_VERSION attached to static URLs is for cache-busting
when we deploy new app versions.
Display last Jenkins comment in popover (#24).
Merge pull request #2 from databricks/master

merge upstream changes