Improved the eclipse project

- added src/res as a source folder for the eclipse project
- print more descriptive resource bundle errors

.classpath

 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src/java"/>
+	<classpathentry kind="src" path="src/res"/>
 	<classpathentry kind="src" path="tinytemplate/src/java"/>
 	<classpathentry kind="src" path="src/gen">
 		<attributes>

src/java/org/jastadd/JastAdd.java

@@ -61,7 +61,7 @@ public class JastAdd {
       version = resources.getString("version");
       timestamp = resources.getString("timestamp");
     } catch (MissingResourceException e) {
-      throw new Error("Could not open Version resource bundle");
+      throw new Error("Could load version info: " + e.getMessage());
     }
   }