Merge pull request #17 from dimagi/fada-observations

change percentage calculation in fada observations report
fix Case:60659 (fada observations double counts data)
Merge pull request #18 from dimagi/double-count

fix Case:60659 (fada observations double counts data)
don't break on malformed fixture items (Case:61333)
Merge pull request #19 from dimagi/malformed-fixtures

don't break on malformed fixture items (Case:61333)
fix data references in report template
display correct relative apneic intervention percent