Release notes:

* The new built-in `integer` token type matches 64-bit unsigned integer values.

* Owl now supports regexp-like `pattern{n, m}` syntax for explicitly-counted
  repetitions.  As an extension, you can use this syntax for delimited lists as
  well: `pattern{delimiter}`.  Thanks to Jeff Walker for proposing this syntax.

Release notes:

* Custom whitespace is now supported.  Use the '.whitespace' keyword to
  specify strings that will be parsed as whitespace.

* The `OWL_WHITESPACE` constant can also be returned from a custom parsing
  function to indicate whitespace.

* Escaping the characters b, f, n, r, or t within a string will now
  produce the corresponding control character.

* The '-h'/'--help' option now works properly.

* To prevent conflicts with keywords that begin with a hyphen character,
  identifiers can no longer end with a hyphen.

Release notes:

* Owl now supports custom tokens using the '.token' keyword.  See the
  documentation for more information.

* The 'line-comment-token' keyword is now '.line-comment-token' for
  consistency with '.token'.

* A token type (like number, string, or identifier) is no longer matched
  if it doesn't appear in the grammar.  This means the grammar

      a = '1' '.0'

  will match the text "1.0" instead of matching a number and giving an
  error.

tag owl.v1