Specify sourceDirectory in pom.xml

This change allows NetBeans to show the project source files in the
Projects pane by simply opening the pom.xml as a project

Change-Id: Ib78c356f94cbb76c7d81f62e672e2c72d9d75ef8
Ignore nbactions.xml

This file is a per-user build customization file created by NetBeans,
which is often created for documentation projects to define the
"clean generate-sources" action for easy access in the UI.

Change-Id: Ied67832349f791f8373c1dadfbb7a14bb824f05c
Merge "Specify sourceDirectory in pom.xml"