Add another test to phone-number_test.hs

Signed-off-by: Bernhard Häussner <bxt@die-optimisten.net>
Factor out some methods in nucleotide-count/dna.rb
Remove use of partial application in word-count.clj
Add haskell/grade-school assignment with exercism fetch
Adjust grade-school_test.hs
Add a very rudimentary School.hs