init files for libraries

[gregmac]

Allow (optional) init files (from CI 1.3) to initialize libraries.

Useful for libraries where the object is not created by just doing "new $class", but instead via a singleton or factory method.

[Tido]

Here's Greg's patch for CI 1.5.0: http://codeigniter.com/forums/viewthread/46779/

[Shadowhand]

Not sure if this bug is still valid. Greg?

[Shadowhand]

Use a helper if you need something special to load a library. With all the complexity of the auto-loader and resource finding, I just don't see a reason to add more filesystem checks for a feature that almost everyone quit using.