Preliminary work on getting paypal integrated
Makes Payment an STI class

We now have ManualPayment and allows for PaypalPayment
Adds add_host_paypal_account rake task
Paypal IPN handling
Adds logging for GATEWAY.setup_purchase
Adds PayPal specific information to payment table
Redirect to tournament registration page
Adds PayPal request specs
Implements paypal completed and canceled handling
Payment table redone

Adds a separate table for Paypal and ManualPayments
Redo the table columns for Manual and Paypal payments
Extract the gateway stub to a separate file
Adds paypal completed page
Adds cancel page message
Implements canceled page,completed does not redirect
Fixes issue with payment admin
Move sqlite3 to dev group so that it works for Taps but does not mess up Heroku
Adds rails_best_practices
Adds better_errors
Adds guard and guard-rspec
Only display paypal link when paypal payment is enabled