Merge pull request #1 from brtdv/gh-pages

I'm interested too!
Improve content
Improve content
Split interested/attendees section
Add multi col to attendees list as well
Make the headings black
Add Bramus
I'm interested!
Merge pull request #2 from Diewy/patch-1

I'm interested!
Add myself to the interested people
Add Jan (and diewi)
Merge branch 'gh-pages' of github.com:Wolfr/jekyll-camp into gh-pages

Conflicts:
	_includes/main-content.md
Needs whitespace at start of file to parse first h1 for some reason
add Kristof
Update main-content.md
Add Thomas