Added support for python virtualenv plugin

Change-Id: Ie21699d43ff6331ae93cc83d8f9751ac683b43fa
Added support for Delivery Pipeline Plugin

Change-Id: I54cfa9153700e141d8ba78c881998553b8081658
ArtifactDeployer Plugin support added

This plugin makes it possible to copy artifacts to remote locations.

Change-Id: I39fbee7b397efb8560f340f0f02b51bf6ebcfd74
Test for email-ext publisher

Also add the test fixture as an example in the documentation.

Change-Id: Iff253e52f9aa900bb61c6f621844bab4d8e696f2
Add attachment pattern expression to email-ext.

Change-Id: I38f58a081bdd591bc13cfff177971f7ff036ad23
Merge "Added support for Delivery Pipeline Plugin"
Merge "Added support for python virtualenv plugin"
Merge "Test for email-ext publisher"
Merge "Add attachment pattern expression to email-ext."