Removed .rspec config from git ignore
add
Modified gitignore to exclude all tmp dirs and files
adds Procfile for foreman
Addes Mailchimp with first-pass subsribe

1. Adds error handler to subscription action
2. Adds mailchimp funcitonality in lib
3. Adds link on hompage for subscribe
Merge pull request #2 from michaelkelly322/integrate_mailchimp

Integrate mailchimp for user email subscription (cleanup of tmp in repo as well)