Merge branch 'new-theme'
Changed layout of livepreview
Updated css explanation and added an exercise
Stylesheets intro and selectors finished
Added advanced CSS exercise
CSS boxmodel more
Added explanation for float
New CSS exercise
Extra reference chapter on formatting text
Added example linked stylesheet
Changed link from hsbos.nl to avans.nl
Removed 'tip' that was advising the use of tables for formatting webpages
Rename plus small clarifications in css
More small changes
Changed ns assignment to a downloadable zip file
Added more values for css text properties
Removed conflict information. Too advanced for intro
Minor issues in CSS text
Remove wacky offbeat markup
More markup fixes