Added GetURIParts, which accepts a URI and breaks it down into individual parts.

Added Features
Added an option "CollapseWhitespace" parameter to HtmlToText, defaulted to "True" to preserve existing behavior. In some circumstances, you do not want to collapse/strip whitespace, particularly when feeding the text to <pre> or other formatting scenarios.

BugFixes
Changed LinkifyText to no longer encode HTML entities; this was causing expected behavior when used with HtmlToText. If you want to encode entities, do it deparately.