STORM-406: Fix for storm CSRF vulnerability using ring-anti-forgery.
STORM-460: Fix for storm CSRF vulnerability using ring-anti-forgery.
Merge branch 'STORM-406' of https://github.com/Parth-Brahmbhatt/incubator-storm into STORM-406
changing variable name to antiForgeryToken, updating UI Rest API Document.
Merge remote-tracking branch 'upstream/security' into STORM-406

Conflicts:
	storm-core/pom.xml
	storm-core/src/clj/backtype/storm/ui/core.clj
Scheduler handles already used slot not reported by supervisor
Merge remote-tracking branch 'upstream/security' into STORM-406

Conflicts:
	STORM-UI-REST-API.md
fix indentation
Merge branch 'mt-scheduler-used-node-check' of https://github.com/kishorvpatil/incubator-storm into STORM-479-merge

STORM-479 (Security) Multi-tenant scheduler needs extra check for used slots