Add public facing form for adding Cleveland Rails companies

[schneidmaster]

Depends on #6

We should add a public facing form for Cleveland based Rails companies to be submitted for inclusion in our list. The form could just reuse the Company model, with published defaulted to false. It would be ideal if we could have it email site managers to let them know there's a new company to review. We should also have a captcha on the form with the recaptcha gem to prevent spambot submissions.

[joelbyler]

This may be at least temporarily resolved with #17