Merge pull request #38 from michaelnflx/master

Use Edda to crawl cloud resources so that we can improve performance and accuracy.
Merge pull request #39 from michaelnflx/master

Fix property name and test failure
update cloudbees link
update README
Merge pull request #40 from michaelnflx/master

Enable AMI cleanup with Edda
Merge pull request #41 from michaelnflx/master

When probability is bigger than 1, select more than 1 instances
Merge pull request #42 from michaelnflx/master

Add debug information when failing to send Janitor email
Disable the Janitor rule that requires Edda by default
Merge pull request #43 from michaelnflx/hotfix

Disable the Janitor rule that requires Edda by default
Refactor to allow overriding the method for getting marked resources