Compensate for the stripe surcharge before charging the user's card
Added note about surcharge & fixed integer bug.
Add validation for amount.
Updated compenstation formula.
Improve precision of Stripe compensator
Merge remote-tracking branch 'origin/compensate-stripe-charges' into compensate-stripe-charges
Merge branch origin/compensate-stripe-charges with local.
Added note about surcharge.
Compenstated charge appears in Stripe payment form.
Merge pull request #170 from tmcyf/compensate-stripe-charges

[RFC] Compensate stripe charges