Include `hipchat.rb`.

This commit refs #112.
Install the prerequisite gems.

This commit refs #112.
Deploy the configuration file for hipchat notification.

- Deploy the configuration file for hipchat notification.
- Add encrypted data bag for hipchat notification.

This commit refs #112.
Merge pull request #112 from kazu634/id/112

[td-agent] hipchatによる通知を有効にする