Moved the javascript includes in html head.
Revision graph sometimes broken (#11612).
Upgraded raphael.js to 2.1.0 (#10419).
Set branch to stable.
Added 2.1-stable branch.
Set version to 2.1.0.
do not show estimated time if it is nil on issue page
add asserting that issue estimated hours is nil when creating minimal issue
gantt: use content_tag instead of html tag at the tooltip
gantt: use content_tag instead of html tag at the label on the right
