Removes teaspoon gem artifacts

We don’t have JasmineJS set up for JS testing, so let’s remove the
teaspoon gem till if/when that's added. A lot of the JS can be tested
from Capybara, so for simplicity it would make more sense to do the
testing there.
Merge pull request #525 from codeforamerica/removes-teaspoon

Removes teaspoon gem artifacts