Multi-site Google Login modification

Hello Sergio,
I use your Marketplace plugin "Google Login Hook". Some time ago I needed functionality that would allow me to put different client_secrets to different Liferay sites (not instances). Therefore I modified your sources a bit, I've done the following changes:
* Create expando field '_google-login-json-code_' for _Group_ entity (using _UpgradeProcess_)
* Created JSP hook adding *Google Login Settings* to *Site settings*
* Adapted _GoogleOAuth_ to use '_google-login-json-code_' field

I also modified behaviour for google approval prompt - now it is displayed only at first login.

I have seen that you updated your application on Liferay Marketplace recently. You added similar functionality but for Liferay instances - this hovewer is not what I need, I got single instance with many sites, each having own Virtual Host). Anyway, the sources on github are still old, so I couldn't merge with new updates.

I hope I could help you developing this app, if You would like to include my changes, don't hesitate to write me back - I am using Google Login Hook and I'm ready to contribute.

Regards,
Krzysztof Gołębiowski