Fix https://github.com/spring-projects/sts4/issues/59

UriUtil.normalize did not properly ensure that drive-letters on windows
are canonically represented  (i.e allways in upper-case or allways in
lower-case).

headless-services/commons/commons-java/src/main/java/org/springframework/ide/vscode/commons/java/JavaProject.java

@@ -74,4 +74,9 @@ public class JavaProject implements IJavaProject, Disposable {
 	public boolean exists() {
 		return new File(uri).exists();
 	}
+
+	@Override
+	public String toString() {
+		return "JavaProject("+uri+")";
+	}
 }