Going to give articles a test run behind memcached.
Merge pull request #3801 from guardian/fast-articles

Going to give articles a test run behind memcached.
rationalise switches; remove oas html
one ad slot template
remove old oas js code
correct naming converntion for ad slot classes
correct selector for commercial components
tidied up ad slot class names
remove master adverts switch; take out query string generation from document-write
fixed article's ad  tests
correct testing when inserting script
Merge pull request #3790 from guardian/oas-genocide

OAS genocide
commercial, html for masterclasses
commercial, masterclasses layout
commercial, styling and layout for masterclasses
commercial, styles for masterclasses