Add initial JS
Add wordCounter.js to the spec runners
Add tests for word count
Remove word count paragraph from template

Not relevant to users without Javascript so shouldn't be in this file
Fix GDM reference error in wordCounter.js

GOVUK.GDM does not current exist at this point in
the script so we need to provide a case for that.
Add call to wordCounter when the page loads
Merge pull request #41 from alphagov/add-word-count-js

Add word count js