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: I8c24d5d34c95a86b455bd0030469a78af7a621ac
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: I4163e261d8115f0ddbb6d90c4af5a45523d52e3d
Merge "Ignore nbactions.xml"