Edited Feature: Allow custom locations in V8Proxy.GetDirPaths [34]

I am bundling the ClearScript DLLs as embedded resources in my main application/dll. At runtime I extract ClearScriptV8-XX.dll and v8-xXX.dll to a temporary path (typically Temporary ASP.NET Files) so that they can be loaded from disk.

In order to support this I have added a simple static API which allows adding custom locations returned by V8Proxy.GetDirPaths. It would be ideal if some equivalent functionality were included in the library.

This issue is somewhat related to https://clearscript.codeplex.com/workitem/17