Fixes #1857. Add a NeedsTriage Issues Dashboard

[miketaylr]

All commits have already been reviewed, this exists to merge into master. I'll give it a review as well (since I didn't do any of the work :p)

Nice work @magsout @karlcow.

[miketaylr]

ok, rebased against master and fixed the merge conflict. ready for re-review.

[miketaylr]

Interesting error when I try to run the app on the branch:

🐓 python run.py 
Statuses Initialization…
Fetching milestones from Github…
Milestones saved in data/
Milestones in memory
Traceback (most recent call last):
  File "run.py", line 35, in <module>
    from webcompat import app
  File "/Users/mitaylor/dev/webcompat.com/webcompat/__init__.py", line 30, in <module>
    import webcompat.views  # nopep8
  File "/Users/mitaylor/dev/webcompat.com/webcompat/views.py", line 355, in <module>
    @app.route('/dashboard/triage')
  File "/Users/mitaylor/.virtualenvs/webcompat/lib/python2.7/site-packages/flask/app.py", line 1080, in decorator
    self.add_url_rule(rule, endpoint, f, **options)
  File "/Users/mitaylor/.virtualenvs/webcompat/lib/python2.7/site-packages/flask/app.py", line 64, in wrapper_func
    return f(self, *args, **kwargs)
  File "/Users/mitaylor/.virtualenvs/webcompat/lib/python2.7/site-packages/flask/app.py", line 1051, in add_url_rule
    'existing endpoint function: %s' % endpoint)
AssertionError: View function mapping is overwriting an existing endpoint function: dashboard_triage

[miketaylr]

That would explain it.

[miketaylr]

Even with the history oddness, r+.

(I don't want to screw up other people's commits -- too scary 👻)