cleanup one test and workingset view extensibility
mutable file object for wsv item class
fix comment
rework classes array
allow refresh to update the class list without rebuilding the entire view
update doc to support jQuery for IconProvider
update comment
update comment again
remove unused var in test
merge with master
rtc:nits
Merge branch 'master' into jeff/wsv-extensibility
Merge pull request #9054 from adobe/jeff/wsv-extensibility

Working Set View Extensibility