Restore styles for context menu.
Remove unused azkaban.nav.js since dropdowns are now provided by Bootstrap.
Make flow and executing flow page SVG view look more reasonable.
Remove unused staging flow page code.
Fix job list for executing flow page.
Fix context menu z-ordering for context menu on executing flow panel.
Fix buttons on executing flow page.
Fix flow progress bars.
Fix some breadcrumbs and page headers.
Fix colspan for message displayed when table has no rows.
Merge pull request #80 from davidzchen/bootstrap_ui

New title bar and more UI fixes.