[ANN] ANSI v1.3.0 released

ANSI 1.3.0 has been released.

The ANSI project is a collection of ANSI escape code related libraries enabling ANSI code based colorization and stylization of output. It is very nice for beautifying shell output.

* home: http://rubyworks.github.com/ansi
* work: http://github.com/rubyworks/ansi

This release cleans up the Code module. It adds support for x-term 256 color codes. Also, the Diff class is now awesome, making use of an LCS algorithm. But the most important difference with this release is that the String core extensions are in their own file, core.rb. If you want to use them you will need to require `ansi` or `ansi/core`.

Changes:

* Clean-up Code module.
* Utilize common chart for Code methods.
* Constants now have their own module.
* Move core methods to `ansi/core.rb`.
* Add XTerm 256 color code support.
* Improved Diff class with LCS algorithm.