Yapsy's first release

The very first release of Yapsy (a generic python plugin system developped as part of the mathbench project) has been unleashed. This release features the basic implementation of a PluginManager as well as some basic extensions, namely a plugin manager that can store information in a ConfigParser compatible file, and singleton versions of these two classes.

Depending on potential suggestions, new extensions to the base PluginManager may be added in futur versions of Yapsy !