Updated demo page

Removed external javascript file, demo text is now loaded via javascript (better for editor syntax highlighting), added comment to remind that preview on nerdz doesn't work yet
Minor output sdtyle edits, tests output updated

Removed newline after opening tag from some bbcode tags, changed '[cur]' to '[i]' in tests expected output and removed some newlines that caused fauilure of some tests
Added newline after inline code closing tag, fixed demo page
Merge pull request #2 from cenci0/master

Quick update and minor fixes