code: function getWorkspaceFile(logicalName, options) {
  			if (logicalName) {
  				return this._getFile(logicalName, options);
  			}
  			return new Deferred().resolve(null);
  		}
docs: Returns an array of workspace file that match the given logical name and options
  @param {String} logicalName The name of the file to look up, for example, 'orion/objects'
  @param {Object} options The map of search options.
  
  >Supported options include:
  >  * ext - the file extension type to look for, for example 'js'
  >  * icon - the URL or relative path to the icon to describe found files
  >  * type - the name to use for the content type of any found files
  
  @returns {Deferred} Array of found files or ```null```