Do not set ServiceLocator by RhinoSecurityInstaller, this is not his duty

Also updated How to Use.txt, to mention the Castle Windsor installer and example configuration of ServiceLocator
Removed dependency for log4net from nuspec file

Also removed log4net from Rhino.Security.Tests project, as it was used only in one place
Permission instance is now created inside PermissionsBuilderService, so there is there ability to use custom subclass of PermissionsBuilderService

Also unified formatting in this file, and removed compilation warning in RhinoSecurityInstaller.cs about undocumented public method.
Updated version
Merge pull request #9 from whut/master

 Do not set ServiceLocator by RhinoSecurityInstaller, this is not his duty