CAINT-1323: Adding .gitattributes to normalize EOL for different platforms.
Fixing typo in upgrade.properties.
CAINT-1322: Upgrading to struts 2.3.15.1 in light of a serious security vunerability affecting all struts 2.x versions. Peer review by Winston Cheng.
CAINT-1324: Fixing sidebar links on the registration page.
CAINT-1325: Fixing inability to add authorization groups via the UI.
CAINT-1327: Fixing inability to Copy/Disable studies from Manage Study page.
Merging release 1.4.1 back to the master in preparation of the final 1.4.1 release.