add Odnoklassniki.ru provider
docs: http://apiok.ru/wiki/pages/viewpage.action?pageId=42476652
	new file:   plugins/server.admin/app/admin/img/providers/odnoklassniki-config.png
	new file:   plugins/server.admin/app/admin/img/providers/odnoklassniki-keys.png
	new file:   providers/odnoklassniki.json
	new file:   providers/odnoklassniki.png