Adding Common Lisp as a language for exercism.

This changeset includes the bob exercise plus needed support code.
Adding the rna-transcription exercise for Common Lisp
Reverting the curriculum.rb file.

kytrinx points out that putting :commonlisp in the list should wait until it
goes live - so I'm reverting the additions of lisp to this file.
Adding word-count exercise for Lisp
Improving bob code.
Adding anagram exercise for Lisp
Beer Song exercise for lisp.
Merge pull request #1203 from verdammelt/lisp-exercises

Adding Common Lisp as a language for exercism.