Update phpSysInfo library

[SimonSimCity]

It's getting more-and-more a need to update the library phpSysInfo.

This package is using phpSysInfo v1.5 and the current version is 3.0.18
http://phpsysinfo.sourceforge.net/

[nschloe]

Another good example why bundling software is not the best idea. The actual fix would be to unbundle PhpSpeed from any third party library and list it as a dependency.

[SimonSimCity]

Decoupling is by all means a good way. If you have an idea or already an implementation, feel free to create a pull-request for that.