add copied Science Sleuth config with removed OIPs
a-b testing changes to backend
Merge pull request #307 from tongxiang/a-b-testing

Add A/B testing branch & beta single-touch sign-in
Add config for 'Science Sleuth 5% A/B Test'
remove ab-test flags, add logic checking for query params in abtesting beta join mdata
Merge pull request #308 from ArielSD/a-b-testing

Add config for 'Science Sleuth 5% A/B Test'
Merge pull request #309 from tongxiang/remove-abtest-flag

remove ab-test flags, add logic checking for query params in abtesting b...
Merge pull request #310 from DoSomething/dev

merge for deploy single-touch beta opt-in