Add comments to trigger package.
Merge pull request #63 from davidzchen/add_comments_trigger

Add comments to trigger package.
fix bug when executionOptions is null, scheduled items skip execution
fix bug when executionOptions is null, scheduled items skip execution
Merge branch 'master' of github.com:azkaban/azkaban2
Bump d3.js from v2 to v3.
Improve breadcrumbs on executing flow page, flow page, job history page, and job log page.
Merge pull request #64 from davidzchen/bump_d3_version

Bump d3.js from v2 to v3
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.
Merge branch 'master' into adminserver