Capistrano integration

[dmeremyanin]

This PR implements deploy tracking with capistrano.
Simply add to deploy.rb:

require 'rollbar/capistrano'
set :rollbar_token, 'your token'

It will send POST to the deploy endpoint (via Net::HTTP) after each deploy.

Available options:

• rollbar_token - project access token, required
• rollbar_env - deploy environment, rails_env by default

For capistrano/multistage it can be useful:

set(:rollbar_env) { stage }

[brianr]

Nice, thanks! Testing and reviewing this now.

Is it possible to grab the rollbar_token from Rollbar.configuration.access_token? (It'll be there as long as the Rails environment has been initialized, and it has been set in config/initializers/rollbar.rb)

[dmeremyanin]

Current implementation doesn't initialize rails environment (for performance reasons), that is why setting rollbar_token is needed.

[brianr]

Works great, merged. I've also pushed a new version of the gem (0.9.2) to rubygems, updated the readme, and added you to the THANKS list. Thanks again!

[dmeremyanin]

Thanks!