Change function name from stripe_civicrm_buildForm to buildForm now that it is in the Stripe payment class.

https://github.com/drastik/com.drastikbydesign.stripe/issues/164

My installation was not processing the previous method of checking live/test mode correctly -- test mode would come back positive but live mode was empty instead of negative.

See also https://github.com/drastik/com.drastikbydesign.stripe/issues/26#issuecomment-203485309

Fixes #123, typo in Webhook.php.

Note: https://github.com/civicrm/civicrm-core/pull/7479 needs to be applied for the fee to be correctly set.

https://github.com/drastik/com.drastikbydesign.stripe/issues/92

Fix in civicrm_stripe.js that was causing "Stripe.js Not passed" because token was empty.
Fix error message about accessing static variable.
Large cleanup to code structure in stripe.php.