Add audit for characterization status and lane status match
Updated synonym handling for OBI ontology.
Added in support for synonyms. Split out synonyms biosample synonyms and assay synonyms at the experiment object.
Added in audit to check if assay term name is valid in the ontology. Added in 'assay' as variant of the name since we drop that for display.
Fixed aduit for raises to yeild and added in returns.
Merge branch 'master' into 1492-char_status_check_audit
Raise TypeError with value to provide better debugging info.
Merge pull request #443 from ENCODE-DCC/1492-char_status_check_audit

1492 char status check audit
Merge pull request #442 from ENCODE-DCC/1836-obi-syn-audit

#1836 obi synonym plus assay audit
Tidy up logic of embed
deepcopy to avoid modifying raw properties
Merge remote-tracking branch 'origin/master' into 1825-view-25-button