improve flexibility
Refactoring /src/Orchestra/Html/HtmlBuilder.php
Minor code convertion and update HtmlBuilder test cases.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.0'

Conflicts:
	src/Orchestra/Html/HtmlBuilder.php

Signed-off-by: crynobone <crynobone@gmail.com>