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.
Merging the 1.4.1 release branch. Contains the 2.3.15.1 security fixes.