Merge pull request #194 from alicial/update-stripe-dues

Renew a user's subscription when updating their CC info [Refs #168]
Upgrade to ruby-2.1.5

- Switch to pry-byebug
Add an admin-only json listing of members & their profiles
Add .ruby-gemset file
Improve Readme with more specific getting started instructions
Add Stripe subscription status on dues page

- Change dues form to post form instead of AJAX post
- Include user email in Stripe modal so it doesn't need to be entered