[CLC-1912] JRuby 1.7.4 Upgrade
Merge pull request #1155 from yuhunglin/CLC-1912

[CLC-1912] JRuby 1.7.4 Upgrade
CLC-1781 - Tasks: add a separate button to activate the calendar pop-up when editing a task
https://jira.media.berkeley.edu/jira/browse/CLC-1781