rbenv-gemset 0.5.7

Closes #29709.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
aws-elasticbeanstalk 2.6.3

Closes #29706.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Cassandra 2.0.8
cassandra: add 2.0.8 bottle.