Remove stray .erl files left over from Etudes for Erlang.
Eliminate call to list_to_binary; use interpolation instead.
Fix IO.read(device,:line)
Change method for referring to external functions.
Change List.concat to Enum.concat
Add specs for functions.
Change method of getting index for a record's field.
Fix incorrect spelling of "transaction"
Query List Comprehension example (keep this around so that if I ever can convert it to Elixir, I have a base to work from).
Change list_to_binary to to_string; binary_to_list to to_char_list; fix ambiguous comma in list comprehension.
Change list/binary conversion functions, add parens to disambiguate list comprehension.
Change binary/list conversion, disambiguate list comprehension.