Change alpha advert test to 100% of article audience
Different hosts for different variants
Setting the correct variable
Merge branch 'master' into alpha-advert-test

Conflicts:
	common/app/assets/javascripts/modules/experiments/ab.js
	common/app/assets/javascripts/modules/experiments/tests/alpha-
adverts.js
	common/app/conf/switches.scala
Duplicate sequencing into its own js module
Refactor sequence module
Change fronts json endpoint to inclulde shortUrlIds and not full paths
Fix tests and add new test data for shortUrl in trail model
Init sequence module in common bootstrap
Add unit tests for sequence module
Remove erroneous return value in common.js
Add trails object to top-stories json end-point
Correct data-link-context values for sequencing
Merge branch 'master' into onward-sequencing
Clear context once sequence is successfully fetched
Merge branch 'master' into onward-sequencing
Remove common module depency from sequence module
Merge master
Refactor sequence.js to use lodash difference method
Run tests, add database files