require 1.475+

1.475+ is required so we can use AbstractProject.supportsMakeDisabled to check if a row should have a "disable" button
check supportsMakeDisabled before creating disable button

job that don't support doDisable, or TopLevelItems that aren't AbstratcProject (Folders for sample) should not get a disable button that has no effect
Use absolute URL to enable/disable action
Merge pull request #1 from ndeloof/master

don't display "disable" button when not applicable