Bundler integrated Capistrano provider

Executes bundle install during deployment without surrounding bundler
environment. After that, cap deploy is run normally.
Fix Elastic Beanstalk S3 bucket configuration
Merge pull request #85 from dlackty/patch-1

Fix Elastic Beanstalk S3 bucket configuration
Install only gems from heaven and deployment groups
Updates the flowdock gem to the latest. Enables threaded notifications.

flowdock 0.5.0 adds support for the message_thread parameter added in #83
Merge pull request #87 from kiratalent/update-flowdock-gem

Updates the flowdock gem to the latest. Enables threaded notifications.
Merge pull request #86 from flowdock/bundler-capistrano

Bundler enabled Capistrano provider
Merge remote-tracking branch 'upstream/master'