Replace magic string with related constant

src/main/java/com/scrivenvar/util/ProtocolResolver.java

		import java.net.URL;

		+import static com.scrivenvar.util.ProtocolScheme.UNKNOWN;
		+
		/**
		* Responsible for determining the protocol of a resource.

		result = file.toURI().toURL().getProtocol();
		} catch( final MalformedURLException ex ) {
		- // Arbitrary value to avoid identification as a standard protocol.
		- result = "unknown";
		+ // Value guaranteed to avoid identification as a standard protocol.
		+ result = UNKNOWN.toString();
		}

Delta	4 lines added, 2 lines removed, 2-line increase