Azkaban-plugins 3.0.0

Merge pull request #198 from johnyu0520/master

changing communication of azkaban properties WORKFLOW_LINK, JOB_LINK,…

upgrade to 2.6.4

Merge pull request #150 from hluu/master

Prevent XSS in the data viewer and in error message #149

Merge pull request #123 from hluu/master

update to 2.6.2

Release Candidate 3

Release candidate 2

Release Candidate 1

release beta 2