Fix warning about version in filename

So far, versions where always in the x.y.z format. Now I'm also using
x.y.zWIP, and this wasn't expected by the persistence code.

backlog.md

@@ -19,7 +19,8 @@ For now, I'm using a quick Java utility to process the backlog. Here are some co
 * Identify interesting germline for demo  
 * Keyframes in DNA Browser  
 
-+ Start DNA browser in random mode in the middle of movement
++ Fix position of creatures relative to speckled area  
++ Start DNA browser in random mode in the middle of movement  
 
 
 ##Database Persistence

src/main/java/org/nusco/narjillos/serializer/Persistence.java

@@ -121,7 +121,7 @@ private static String readExperimentData(String fileName) {
 
 	private static void checkVersion(String fileName) {
 		String fileNameWithoutExtension = stripExtension(fileName);
-		if (!fileNameWithoutExtension.matches("\\d+\\-\\d+\\.\\d+.\\d+")) {
+		if (!fileNameWithoutExtension.matches("\\d+\\-\\d+\\.\\d+.\\d+\\w*")) {
 			System.err.println("WARNING: This experiment doesn't contain a version in the filename. "
 					+ "I cannot check that it was generated by the same version of Narjillos that you're using now.");
 			return;