[elixir] Add Elixir language README
[go] Add note on `go test` from vim
[elixir] Fetch the bob exercise
[elixir] Pass bob tests w/ trivial implementation
[elixir] Merge bob conditions into general-ish cases

This still contains a literal condition, so we need to work around that.

Submission: http://exercism.io/submissions/7fadf6f1774fb4df69b2580d
[elixir] Remove literal "1, 2, 3" check from Teenager

Submission: http://exercism.io/submissions/713784c9d034488eacab66cd
[elixir] Extract Teenager conds to private functions

Submission: http://exercism.io/submissions/aa9ad0a052870316e15268e4