Have api as first arg for AppTester.check(fn)
Mention api first in AppTester.check(fn)'s description of fn's form in the docstring
Merge branch 'develop' into feature/issue-75-have-api-as-first-arg-for-apptester-checkfn
Merge branch 'feature/issue-75-have-api-as-first-arg-for-apptester-checkfn' into develop