Merge pull request #217 from dburdick/develop

Entity List widget
Merge pull request #218 from dburdick/develop

test fixes, and entity finder refactor swc-458
SWC-456: use single handler instance instead of registration
Merge branch 'develop' of https://github.com/Sage-Bionetworks/SynapseWebClient into develop
Merge pull request #219 from jay-hodgson/develop

SWC-456: use single handler instance instead of registration