Made greedy regexps lazy

Super small fix: In the `$tent_markdown()` function, the `(.*)` quantifiers result in markdown like `*bold*, not bold, *bold again*` being converted to `<b>bold, not bold, bold again</b>` instead of `<b>bold</b>, not bold, <b>bold again</b>`. The '(.*?)' quantifier results in the intended behaviour.
Merge pull request #16 from Laemeur/master

Made greedy regexps lazy