Add JSON path to master index page
Removed master URL from job UI, reduced heading size of basic spark pages
Reduced size of heading
Import cleanup
Merge branch 'master' into master-json

Conflicts:
	core/src/main/scala/spark/deploy/master/ui/IndexPage.scala
Removing extra imports
Merge pull request #758 from pwendell/master-json

Add JSON path to master index page
Merge pull request #760 from karenfeng/heading-update

Clean up web UI page headers