add more keywords for syntax highlighting
get rid of fns from phys that are now in webchurch
change variable names in phys examples
Merge branch 'master' of https://github.com/probmods/chapters
Merge branch 'master' of https://github.com/probmods/chapters
Merge branch 'master' of https://github.com/probmods/chapters
restructure hist and at least partially fix the independent axis
fix histogram - can now deal with zero frequency elements in continuous data
Merge branch 'master' of https://github.com/probmods/chapters