Remove mobile OS detection script
Remove pixel ration detection script
Remove svg support detection script, since it's already in the head of pages
Remove CSS support detection script
Merge branch 'master' of github.com:guardian/frontend into remove-unused-detect-scripts

Conflicts:
	common/app/assets/javascripts/utils/detect.js
	common/test/assets/javascripts/spec/Detect.spec.js
Merge pull request #3470 from guardian/remove-unused-detect-scripts

Remove unused detection scripts