Ignore hr_tree.xml changes and add sample

The sample was taken from the 20150126 snapshot. This allows out-of-band
updates to hr_tree.xml file without complaints from the repo.

NOTE: A backup should probably be copied upon deployment.

Author: kabel

.gitignore

@@ -9,6 +9,7 @@
 /www/config.inc.php
 /www/faculty/all
 /www/wdn
+/data/hr_tree.xml
 /data/faculty_education.csv
 .DS_Store
 /UNL_Directory.esproj/