Catch errors in sending notifications, log warning and continue.

Currently notification exceptions will be raised and cause the deployment to fail. These should be caught and log as a warning, then continue to keep from disrupting deployments.

2013-02-14 23:15:02 -0800 DEBUG : Sending notification to Campfire room 472802.
/Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:762:in `initialize': Operation timed out - connect(2) (Errno::ETIMEDOUT)
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:762:in`open'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:762:in `block in connect'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/timeout.rb:54:in`timeout'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/timeout.rb:99:in `timeout'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:762:in`connect'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:755:in `do_start'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:744:in`start'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:1284:in `request'
from /Users/vsomayaji/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:1026:in`get'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/adapter/net_http.rb:59:in `call'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/response.rb:8:in`call'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/response.rb:8:in `call'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/response.rb:8:in`call'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/response.rb:8:in `call'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/request/json.rb:32:in`call'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/connection.rb:210:in `run_request'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/faraday-0.7.6/lib/faraday/connection.rb:93:in`get'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/tinder-1.8.0/lib/tinder/connection.rb:76:in `get'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/tinder-1.8.0/lib/tinder/campfire.rb:34:in`rooms'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/tinder-1.8.0/lib/tinder/campfire.rb:41:in `find_room_by_id'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/notifier/campfire.rb:30:in`block in send'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/notifier/campfire.rb:28:in `each'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/notifier/campfire.rb:28:in`send'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/notifier.rb:40:in `block in send'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/notifier.rb:34:in`each'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/notifier.rb:34:in `send'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/notifier.rb:15:in`send_deployment_start_message'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/cli/deploy.rb:81:in `block in deploy'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/cli/deploy.rb:59:in`each'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/cli/deploy.rb:59:in `deploy'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/lib/simple_deploy/cli.rb:39:in`start'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/gems/simple_deploy-0.6.7/bin/simple_deploy:6:in `'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/bin/simple_deploy:19:in`load'
from /Users/vsomayaji/.rvm/gems/ruby-1.9.3-p194@simple_deploy/bin/simple_deploy:19:in `'