Add a feed of public queries to the workspace workflow

This is backwards compatible by wrapping public queries code with a 2.2.0 minimum version requirement.
Increase max serrano version to 2.2.0(minimum for public query support)
Pass queryModalRegion for public queries too since owners can edit them
Further limit data and controls shown for public queries
Update the public queries list when queries are edited and saved
Add editable flag to determine whether user can edit query

This flag is explicitly set to false for public queries as we don't want people to be able to edit them. Previously, I used the publicity of the query to determine whether the query should be editable but this had the side effect of making user-owned public queries uneditable now that Serrano is returning the publicity for owned and shared queries.
Allow the user to edit the publicity of their queries
Style fixes
Add loading indicators and more robust empty text to query collections
Add an icon to indicate which queries are public
Fix bad name for public queries region that was lost during rebase
Make queries readonly by default to avoid passing regions unnecessarily
Merge pull request #334 from cbmi/issue-211

Add a feed of public queries to the workspace workflow