Updated flapjack.rb for 0.13

Changed references from `Oj` to `MultiJson`.
Proxy support for machines sitting behind a proxy

Just added support for going through a proxy while initializing the hipchat client.
Improves redis check to add database
Merge pull request #689 from clarkf/master

Updated flapjack.rb for 0.13
fix options, fix test
Merge pull request #698 from abhishekjain88/patch-1

Proxy support for machines sitting behind a proxy
Merge pull request #699 from 3scale/rhoml/fix-redis-check

Improves redis check to add database
Adds docker metrics plugin

Originally made by @mikz
Fix shadowing
Add a Rubocop rake task
add ability to use multiple pagerduty apikeys
Merge pull request #1 from optimizely/multiple-pagerduty-apikeys

add ability to use multiple pagerduty apikeys
Merge pull request #703 from optimizely/master

add ability to use multiple pagerduty apikeys
Add readlines
Merge pull request #701 from simondean/rubocop_rake_task

Add a Rubocop rake task
Merge pull request #700 from 3scale/rhoml/add-docker-metrics

Adds docker metrics plugin
Adds some preamble to the plugin
Merge pull request #704 from 3scale/master

Adds some preamble to docker metrics plugin
Added basic http authentication support
Fixed ruby multiline style issue.

Removed "then" at ln 167 since it's in a multiline if statement.