Merge pull request #170 from sharoonthomas/develop

Structured data improvements
Move lightbox css and js link tags to product template #5970
Added test for CSS validity.
Modified requirements.txt to add cssutils.
Merge pull request #171 from goyal1092/feature/task-5970

Move lightbox css and js link tags to product template #5970
Fixed style.css syntax error; css test now passes.
Merge pull request #172 from VaticanCameos/css-test

CSS validation test.
Disable pay button on first click to prevent multiple submissions #5858
Merge pull request #174 from GauravButola/pay-button-5858

Disable pay button on first click to prevent multiple submissions #5858
Encapsulate ga events on separate block
Display breadcrumb on all templates with microdata
Merge pull request #173 from sharoonthomas/breadcrumb

Display breadcrumb on all templates with microdata
Merge pull request #175 from sharoonthomas/ga

Encapsulate ga events on separate block
Render the ga code in sale confirmation