Add a GenerateVDLdocMojo.java to allow VDLdoc to be generated as a maven goal

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: liferay-faces-2.1.3-ga4, liferay-faces-3.0.3-legacy-ga4, liferay-faces-3.0.3-ga4, liferay-faces-3.1.3-ga4
• Fix Version/s: liferay-faces-2.1.4-ga5, liferay-faces-2.2.4-ga5, liferay-faces-3.0.4-legacy-ga5, liferay-faces-3.0.4-ga5, liferay-faces-3.1.4-ga5, liferay-faces-3.2.4-ga5
• Component/s: None
• Labels: None

This task requires creating a mojo which will call VLDdoc's generate() method, and creating a pom for this project.