fiddled with capybara drivers
added odk form rendering spec
got odk output working
fixed validation for multilevel
fixed display of blank and partially blank multilevel answers
moved odk submission test to rspec
added response xml spec
made response handle multilevel odk submissions
fixed required check on xml form render
fixed failing odk rendering test
fixed bug in api spec
Merge branch '1529_odk_hier_opt_sets' into develop