Created the class for cleaning unused site images from the liferay-docs
repository.
Wrote CleanImagesStieMain.Java
Class is fully functional, deleting unused images as expected. Still
needs to be cleaned up and spit the proper messages in the console.
Edited CleanImagesSiteMain.Java and added new "clean-images" task to
build-site-common.xml
Removed comments from class, formatted.
Ran ant deploy to put new class in liferay-doc-utils.jar
Merge branch 'clean-images-site-main' of https://github.com/rbohl/liferay-docs into clean-site-images
Minor cleanup to CleanImagesSiteMain
Refresh liferay-doc-utils.jar
Merge branch 'build-metadata-file' into clean-site-images

Conflicts:
	build-site-common.xml
Merge pull request #1027 from jhinkey/clean-site-images

Clean site images