Erlang (script) bob

Implement bob in Erlang. Using escript because it's easier to run and parse
CLI arguments. Supports drunk, sport, programming, and xmas modes. Doesn't
support short CLI arguments.
Alphabetise Erlang entry in README

Because OCD people.
Erlang sleep between words when drunk

To match the Perl implementation. I've opted for a function with a different
argument signature rather than specifying a sleep duration of 0 and always
calling timer:sleep.
Merge pull request #22 from dcarley/erlang_script

Erlang (script) bob