Merge pull request #195 from adamdruppe/application_form

Application form updates
Langauge tweaks to participant application form to make it more clear about what info we want for their volunteer work and other commitments
Merge pull request #197 from sadleb/application_form_language_tweaks

Language tweaks to participant application form to make it more clear
Change the language of the JOIN US button on the student and coach pages.  Tweak the email text
Merge pull request #198 from sadleb/application_language_tweaks

Now that the application is live, the JOIN US language needed some tweaks
send button fix and new flow modifications