Improve breadcrumbs on executing flow page, flow page, job history page, and job log page.
Merge branch 'master' into fix_breadcrumbs
Style changes in some JS views.
Move hasClass, addClass, and removeClass to azkaban.common.utils.js.
Clean up breadcrumbs on job page and job history page.
Add header comments to js files.
Merge pull request #65 from davidzchen/fix_breadcrumbs

Merge breadcrumb improvements.