CHANGE-714 Add progressive-enhancement to checkout flow for PCI compliance when card details collected onsite

Conflicts:
	not_for_release/testFramework/bamboo_scripts/webtest_builder.sh
	not_for_release/testFramework/webtests/allWebTests.php
	not_for_release/testFramework/webtests/localconfig_wilt.php
	not_for_release/testFramework/webtests/testAdminSSLMode.php
	not_for_release/testFramework/webtests/testCreateAccount.php
	not_for_release/testFramework/webtests/testUseCoupons.php
	not_for_release/testFramework/webtests/zcCommonTestResources.php
CHANGE-709 - Refactor logging infrastructure

Conflicts:
	admin/includes/init_includes/init_cache_key_check.php
date stamps on CHANGE-709

Conflicts:
	admin/includes/init_includes/init_cache_key_check.php
CHANGE-709 - Refactor logging infrastructure
- Add severity-level filter option
- Add language defines, and log-data-interpretation instructions
CHANGE-709 - very basic fix to display problem
CHANGE-709 - very basic fix to display problem
CHANGE-714 progressive enhancement of checkout

fix fallback loading of jquery
CHANGE-709 - Refactor logging infrastructure
- Changed init point to fire after sessions have started, since some of the logging messages contain data generated by dependencies loaded with session infrastructure
CHANGE-714 - update jQuery CDN
CHANGE-714 - update syntax and formatting
CHANGE-564 - Version stamping
CHANGE-564 - Docs
Fix init_cache_key_check.php redirect loop which occurs when the user deletes the /cache/ folder

Conflicts:
	admin/includes/init_includes/init_cache_key_check.php
Docs

Conflicts:
	docs/implementation-guide-v153.pdf
CHANGE-721 - Update demo data
CHANGE-721: Update demo data
Fix products_price_sorter value
CHANGE-714 - Add progressive-enhancement to checkout flow for PCI compliance when card details collected onsite
Just fixing a conflict from a previous merge
Fix password-authentication problem on db upgrades
Merge pull request #86 from zencart/v154

V154