Refactor breadcrumb class
Refactor links array and remove last link option

The option to render the last crumb as a link was functionally deprecated.  It can now be removed.
Apply PSR formatting
Remove reset method and add test
Update main page template
Update defined_page.php for secure images
Some servers returning references to an invalid index value if the SQL query returned is empty
Shipping module unable to register an error
Correct issues on Gift Certificate defines
Page not found when incorrect EZPage link remove status
Merge pull request #151 from ajeh/gift-certificates

Correct issues on Gift Certificate defines
Update docblocks
Merge pull request #152 from ajeh/EZPages-header

Page not found when incorrect EZPage link remove status
Merge pull request #150 from ajeh/shipping-module-error-reference

Shipping module unable to register an error
Merge pull request #147 from texdc/160_refactor_breadcrumb

Refactor Breadcrumb class
Merge pull request #146 from ajeh/definedpage

Update defined_page.php for secure images
Merge pull request #149 from ajeh/zen_has_product_attributes

Some servers returning references to an invalid index
Fix "Undefined index: USER" error from #127
constant('SID')

ISSUE-82 - (continuation of) Fix odd PHP quirk which triggers fatal error "Allowed memory size of --- bytes exhausted" when accessing SID constant
(adding to zc_install for consistency)
Merge pull request #159 from drbyte/issue-82

constant('SID')