OCaml track (DO NOT MERGE YET)

OCaml track, work in progress.

- [x] bob
- [x] word-count
- [x] anagram
- [x] beer-song
- [x] rna-transcription
- [x] nucleotide-count
- [x] point-mutations
- [x] phone-number
- [x] grade-school
- [ ] leap (SKIPPED, too simple)
- [ ] etl (SKIPPED, too simple)
- [ ] meetup (SKIPPED, too many people have said they don't like this exercise)
- [ ] space-age
- [ ] grains
- [ ] gigasecond
- [ ] triangle
- [ ] scrabble-score
- [ ] roman-numerals
- [ ] binary
- [x] prime-factors
- [ ] raindrops
- [ ] allergies
- [ ] atbash-cipher