Merge pull request #377 from dburdick/swc-652

update banners and comment out for later release
Merge pull request #379 from dburdick/swc-652

Open up DREAM8 challenges
Merge branch 'release-y' into develop
Remove portal endpoint from stackConfig
Merge pull request #382 from xschildw/remove-portal-endpoint

Remove portal endpoint from stackConfig
Merge pull request #383 from xschildw/remove-portal-endpoint

Remove portal endpoint from stackConfig
SWC-665: single project reference per challenge (not showing all subchallenges)
SWC-605: set load listener before setting url, and use HIDDEN style to fix calcuation
SWC-605: block Image widget editor insertion of markdown unless the file extension is right.  suggest png or jpg for images
fix challenge overview page
Merge pull request #386 from jay-hodgson/SWC-605

Swc 605
Merge pull request #385 from jay-hodgson/SWC-665

SWC-665: single project reference per challenge (not showing all subchal...
Merge pull request #384 from dburdick/swc-81

Initial performance improvements
fix challenge overview page
Merge pull request #388 from jay-hodgson/release-z

fix challenge overview page (merge from release-y)
Merge pull request #389 from jay-hodgson/develop

fix challenge overview page (merge from release-y)
SWC-605: set load listener before setting url, and use HIDDEN style to fix calcuation
SWC-605: block Image widget editor insertion of markdown unless the file extension is right.  suggest png or jpg for images
Merge pull request #390 from jay-hodgson/release-z

SWC-605: merging up to release-z from develop after re-evaluation of impact/risk
SWC-519: widgetize subpages