Added Html Form Textarea with abstract DomElement for converting to string.
fixed error found by testing and added documentation
enhanced array, renamed toJSON to toJson
added whitebox test for new class textarea
Added Lorem ipsum class
enhanced array (especially index-key management)

- single keys can be replaced
- multiple keys can be replaced in assoc array
an html element can now return it's inner html and text
enhanced test for textarea with new possibilities
a file node can now return it's siblings