`:rollbar_environment` support for non-rails app deployments
`:rollbar_environment` support for non-rails app deployments

Set the `:rollbar_environment` variable to your target environment.  If
not set, the default is `rails_env` as before, for backwards
compatibility.

Example:
```ruby
set :environment, ENV['on'] || 'staging'

set :rollbar_environment, environment
```

code-lever/mina-rollbar