Merge pull request #215 from jay-hodgson/develop

SWC-248: support code preview client-side
Created EntityFinder widget for SWC-313 and other entity/entity version selection needs
Unhook stub client
Added EntityList markdown widget
updated entity list widget to use current code base
add to widget insert menu
Add in FileHandle downloading, fix linking issue
build changes
updated pom, code review changes
Merge pull request #217 from dburdick/develop

Entity List widget
text fixes, and entity finder refactor swc-458
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