Merge pull request #47 from nealcpeters/tutorial_page

Tutorial page
alex dryed this the hell up
alex with so called teamwork from me found out how to highlight the selected
removed code label for blocks on show page
added links to subchapters on chapter page
Merge pull request #48 from nealcpeters/codesnippet

Codesnippet
ajaxified the show tutorial page
Merge branch 'master' into tutorial_page