Adding defined() checks for constants. Updating readme.

Updating to 3.0 stable.

Fixing minor problems with censoring.

Updated and finalized emoticons. Renamed and moved around some method…

…s. Added a childQuotes setting that removes or parses all child quotes. Completely redid the examples.

Fixed a problem with quotes timestamps breaking. Fixed a problem with…

… unclosed or nested quotes. Added spoiler tags. Rewrote parse() and moved all patterns to $markupCode and $markupResult.