For new installs, don't require phone by default.
Ensure PayPal Express does not send a discount line item if the discount is set to 0.00
Merge pull request #992 from JeffPyeBrook/missing-quotes-in-page-php

Quotes around a constant name were missing
Merge pull request #991 from JeffPyeBrook/cart-class-to-its-own-file

Cart Class File Cleanup and Function Deprecation
Changed version number to 3.8.10
Added public to constructor
Merge pull request #990 from JeffPyeBrook/checkout-form-test-fixes

Checkout Form Class Fix and Enhancement
Merge remote-tracking branch 'upstream/master' into customer-meta-and-checkout