module English: Englishval parse_int : string -> intparse_int s: Like standard int_of_string, but try to convert the first
    twenty english numbers (eg. "one", "two", ... "twenty")
    parse_int "thirteen"
    - : int = 13
    parse_int "5296"
    - : int = 5296
    parse_int "twenty five"
    Exception: (Failure int_of_string).
parse_date s: Convert a date in plain english (eg. "yesterday," "tomorrow," etc.) to a Date.t
    parse_date "Yesterday"
    parse_date "6 8 2010"
    parse_date "4 days hence"
    parse_date "24 weekdays ago"
val parse_date : string -> Core.Date.tval parse_time : string -> Core.Time.t