More robust testing of response. It contains the keys we expect. Might contain more, but I don't care
Merge branch 'master' of github.com:OpenTreeOfLife/opentree-interfaces

Adding more functions
Testing mrca is hard. How do I know what it *should* return?
Merge branch 'master' of github.com:OpenTreeOfLife/opentree-interfaces

Merging in new functions to test
Checking zero length array