[o3] install mongo db (2.6.5)
[o3] add gosu helper
Fix tomcat chown cmds
[o3] restore mongodb
[o3] switch over to 3.0, remove mysql init
[o3] supervisord: don't start mysqld
[o3] add log4j2.xml config and ohamge.conf
[o3] remove mysqld from installed packages
[o3] remove sql.zip
[o3] nginx added (proxy /ohmage to tomcat)