LRDOCS-519 Added tool for removing unused images from a document's images directory
LRDOCS-518 Added section to User Guide's Message Boards section covering the Message Boards Subscription Manager app
Moved uninstalling Social Office subsection to the end of the Installation section
Merge pull request #506 from jrao/LRDOCS-519

http://issues.liferay.com/browse/LRDOCS-519
Merge pull request #507 from jrao/LRDOCS-518

http://issues.liferay.com/browse/LRDOCS-518
Merge pull request #508 from jrao/soffice-installation-reorg

Moved Uninstalling Social Office section to the end of the Installing Social Office section