added a rescue for combined_credit_split_errors in the case where a co-investigator has not been added to a prop
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Merge branch 'development' of github.com:aheward/kuality-coeus into development

* 'development' of github.com:aheward/kuality-coeus:
  Experiment with answering questions.
  Improved the KeyPerson create method to make the Person Certification question instance variables equal to nil if the person is not supposed to be certified.
new scenarios for prop_actions
For Abe: Take a look at why there's a StaleElemenetReference for an 'uncertified' key person
Merge branch 'development' of git://github.com/jonutter/kuality-coeus into development
Added logic about filling out credit splits for key persons with units.