Release Name: 0.2.1

Notes:
Tartan is a Ruby based wiki text parser that allows 
layering of rule sets so you can add one set of rules to another and control ordering and presidency. 

This release cleans up Markdown behavior and adds a preliminary feature to add attributes to block level elements.


Changes:
* removed class support from tables and added a general purpose attribute mechanism
* Generalized the output types so you can pass a list of output types instead of just one and the parser will try to use them in order.  This was done to support Informl where dbhtml is used for specific cases but html is the default.
* added failing test HeadingInsideDiv
* Cleaned up wiki link rules to use terser regular expressions. Changed wikilink helper to not strip spaces since the parsing rules should now be doing it.
* Get "new" Markdown <div markdown="1"> markup to work such that stuff inside the div is parsed as Markdown text (normally it isn't).
* Fixed problem with rake where failing tests caused subsequent tests not to be run.
* Fixed wiki-link rules so that links with text followed by other links will keep to themselves.