Added support for long tags.
Create a new section for credits.
propagate from branch 'it.lapo.asn1js' (head 69060b941e4448ab850ea67c23e27e537f1d3e8f)
            to branch 'it.lapo.asn1js.github-4' (head 573d4e4ee31fe88b47374036b0f5e49c0346b792)
Use objects and methods to increase code readability.
Fix a missing use of the new isUniversal() method.
Closes #4 on GitHub.