Allow CommanderAgents to configure targets.
log configuration changes
Upgrade Rails to 4.1.7, which comes with security fixes.
Upgrade nokogiri to 1.6.4, which comes with security fixes.
Made latlng accessible to liquid
Upgrade slack-notifier to 1.0.0; use webhook URLs instead of tokens.

Slack's service integration instructions now only show Webhook URL, so
this should be reasonable for new users.

For compatibility, allow an existing pair of `team_name` and
`auth_token` to still work.
Merge pull request #617 from knu/upgrade_slack-notifier

Upgrade slack-notifier to 1.0.0; use webhook URLs instead of tokens.
Added specs for the latlng property
Merge pull request #620 from chriseidhof/commander_agent_can_configure

Made latlng accessible to liquid
Merge pull request #612 from cantino/commander_agent_can_configure

Commander agent can configure
Added a PDF info agent
Added a spec for pdfinfo
mock instead of stub the open call
Test the payload as well
Cleanup
Cleanup the Gemfile, added a potential warning