add index functionality, closes #30
add index extensions to clean command
Make the makefile actually work so it doesn't repeat work.
Don't require OS and SITE when building style-guide.
Modified chapter 1 for cross site usage
Fixed some macro calls
Added Leuven specific info
Chapter 2 cross-stie revision
folded in comments
a bit of cleanup and good practices for the batch jobs chapter
Merge pull request #31 from hpcugent/feature/use-index

add index functionality
Merge pull request #39 from gjbex/feature/cross-site

Feature/cross site
Merge pull request #42 from hpcugent/feature/general-cleanup

a bit of cleanup and good practices for the batch jobs chapter
Merge pull request #37 from hpcugent/make-cleanup

Make the makefile care about whether the target is already up to date.
Merge branch 'master' into feature/move-files

Conflicts:
	Makefile
	img/img0400.png
	img/pbs-overview.png
	intro-HPC/img/img0400.png
move examples dir