Helper methods for attributs in Mojo-Executor

MojoExecutorUtils2.java

	public static Attributes with(Attribute...attributes) {
		return new Attributes(attributes);
	}

	public static Attribute attr(String key, String value) {
		return new Attribute(key, value);
	}

	public static Attribute attr(String key, File value) {
		return new Attribute(key, value.getAbsolutePath());
	}