Switch to using the Javascript for Universal Analytics

Also bump the STATIC_GENERATION_NUMBER to break caching of the
old Javascript.
Add a skeleton for the MIT "county performance" page
first iteration of coding up the illustrator mockup
facebook and twitter icons on country-performance buttons
red table column
fix country/county typo
fix mobile h2 style overrides on country-performance page
fix comment form button width on small screens
make county-performance table scale down nicely on narrow screens
Suppress the survey banner on the MIT page
Add a Django form for the petition form
Add the "comments for the senate" form
Present "Opportunity", "Threat" or neither depending on variant
Randomly order the Facebook and Twitter share buttons
Shuffle the senate comments, petition sign up and share buttons
Deal with submissions to either form on the county performance page

Paul has said that we only need to create entries using the existing
feedback mechanism; so this just adds submissions for petition
signatures or comments for the senate to the feedback for these
pages respectively:

  /county-performance/petition
  /county-performance/senate

... marked as non-actionable.

There is some juggling of class-based views required to work with
two forms on a single page, and so that if the form don't pass
validation, the user is redirected to a reduced version of the
page with just the form they were trying to fill.

Note that this doesn't confirm that the supplied email address
actually works (as with the existing feedback mechanism) - for a
serious petitions system one would want to make sure the email
address entered is usable.
Correct indentation according to our policy for HTML templates

(Keeping this indentation change in a separate commit from the
previous one makes the earlier commit clearer without having to
add -w.)
Present all validation errors together, not field-by-field
Use the HTML5 'required' attribute in input elements
Add a CSS class to the <p> that contains all form errors