FIle upload based on Type in share

http://tribloom.com/blogs/michael/2011/05/03/share-dynamic-forms
http://www.ixxus.com/blog/2011/09/customising-the-upload-file-dialog-box-in-alfresco-share/

http://www.ixxus.com/blog/2012/10/solr-facets-alfresco-walkthrough/