Worked on the reference widget/syntax
New files create the reference widget
Edited the ConfigEditor for the reference widget. It no longer produces its own syntax. There is also only one field, the reference itself, for users to input right now.
Edited the test for the edited widget
Added examples of the new syntax in the formatting tips section.
Merge branch 'markdown' into develop

Fixed Conflicts:
	src/main/java/org/sagebionetworks/web/shared/WebConstants.java
Resolved conflicts with web constants.
SWC-647: API key on settings page
new PLFM artifact
SWC-453 Created a reference widget

The widget inserts anchors that redirects to the footnote at the end of the wiki.
SWC-686 Updated strike-out syntax tip.
Test and new PLFM-artifact
PLFM-artifact
Merge pull request #438 from heidiso/develop

Added to formatting tips for new syntax.
Merge pull request #440 from dburdick/swc-647

Swc 647
SWC-453 Finished the reference widget

Made adjustments to the reference syntax to accept more formats.
Merge branch with ref widget implementation into develop
Fixed unneeded changes to the constants to avoid confusion.
Fixed unneeded changes to avoid confusion.
Merge branch 'develop' of https://github.com/Sage-Bionetworks/SynapseWebClient into develop