Changes the options on out markdown parser to be more liberal.
Also makes the blocks parser and main parser have the same options.
Gives a live preview of markdown blocks in the page editor;
it's not really the best since it doesn't show what the page itself
will look like... I'll contemplate changing that...Perhaps render
what the whole page will look like beneath all the editing stuff?
I feel like it should be above the editing boxes, though...hmmm