v2.2.1: Minor Updates & Fixes

🚀 Feature

• Logic to support WHMCS & cron.php being isolated
• Flag to reinject the Invoice PDF template with code

💅 Polish

• Hide the BPAY Biller Name lookup (deprecated method) (#2)
• Fatal Errors updated to reflect origination from BPAY Manager
• Improved the README file; Added a CONTRIBUTING file to the repo

🐛 Bug Fix

• SQL Error in bpay_mgr_hooks.php (rogue apostrophe) (resolves #13)
• More work towards resolving #1 (relative/absolute, superglobals, etc)