Intelligent current working directory resolution about vertx-examples

[cescoffier]

I've made an initial implementation. Quite simple:

try {
      // We need to use the canonical file. Without the file name is .
      File current = new File(".").getCanonicalFile();
      if (exampleDir.startsWith(current.getName())  && !     exampleDir.equals(current.getName())) {
        exampleDir = exampleDir.substring(current.getName().length() + 1);
      }
    } catch (IOException e) {
      // Ignore it.
    }

I need to test it on windows, and in various IDEs

[cescoffier]

We start discussing it on #89