v0.1.0

• Add: A Terminal can now be defined with more trivial callbacks. The *TerminalFactory now has FuncByte() and FuncRune():

  NewTerm(tInt, "int").FuncByte(isDigit, bytesToInt)
  NewWhitespace().FuncRune(unicode.IsSpace)
  
  func isDigit(b byte) bool              { return b >= '0' && b <= '9' }
  func bytesToInt(b []byte) (int, error) { return strconv.Atoi(string(b)) }