Knuth Shuffle

Still has some bugs
Question randomization working
Nits for meacer
nits for meacer
Update comment
Revert "Update comment"

This reverts commit dc7d87266c58f0ac62bb72c1b50c9e45d0a438a2.
fixing merge
Merge branch 'adrifelt-randomization'
Merge branch 'master' of https://github.com/adrifelt/experience-sampling
Merge pull request #22 from adrifelt/randomization

Adds randomization, including ability to anchor the last element