* some improvements for Makefile.

- remove the special handling for Arch Linux (Thanks to @xyproto).
  This closes #22.
- use "logo" instead of "ucblogo" because it looks canonical. (#22)
- check the executable name of Node.js. This closes #18.
- remove the target file when it is failed (.DELETE_ON_ERROR).
  This fixes #14.
* make README.md generation faster.

dpkg is invoked just once.
* use Console.Write instead of WriteLine.

Because it is shorter.
* fix LZW decompressor potential bug.

The first character of compressed string was ignored.
* expand tr.

It is shorter.
* use PR in Logo, which is equivalent to PRINT.
* gain 14 bytes.
* easy compression in Scala.
Shorten check of the executable name of Node.js