Added Slimdump

Slimdump is a small dumper tool for MySQL.

README.md

 * [print_o](https://github.com/koriym/print_o) - An object graph visualizer.
 * [Alias](https://github.com/fuelphp/alias) - A class aliasing library.
 * [Cake Utility](https://github.com/cakephp/utility) - Utility classes such as Inflector, String, Hash, Security and Xml (CP).
+* [Slimdump](https://github.com/webfactory/slimdump) - A easy dumper tool for MySQL.
 
 # Software
 *Software for creating a development environment.*