Updated file loading so that embedded directories are supported.
Created by: ivanmrsulja
What does this pull request do?
Enables loading RDF files from sub'directories.
What's new?
Changed RDFFilesLoader class (getPaths method) so that it supports loading files from sub-directories using visitor pattern.
How should this be tested?
Startup VIVO, RDF files from sub-directories should be loaded.
Interested parties
@litvinovg @chenejac @brianjlowe