Simple class to send custom server-side events to Google Analytics
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Heavily influenced by the http://code.google.com/p/serversidegoogleanalytics

HOW TO USE:
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* Track page views

        Gabba::Gabba.new("UT-1234", "mydomain.com").page_view("something", "track/me")

* Track custom events

        Gabba::Gabba.new("UT-1234", "mydomain.com").event("Videos", "Play", "ID", "123", true)

* Works with existing client-side Google Analytics cookies

        gabba = Gabba::Gabba.new("UT-1234", "mydomain.com")

        # grab the __utma unique identifier
        gabba.identify_user(cookies[:__utma])

        # trigger actions as normal
        gabba.page_view("something", "track/me")

* Setting custom vars

        # Index: 1 through 5
        index = 1

        # Scope: VISITOR, SESSION or PAGE
        scope = Gabba::Gabba::VISITOR

        # Set var
        gabba.set_custom_var(index, 'Name', 'Value', scope)

        # Track the event (all vars will be included)
        gabba.event(...)

        # Track the page view (all vars will be included)
        gabba.page_view(...)

* Removing custom vars

        # Index: 1 through 5
        index = 1

        # Delete var with this index
        gabba.delete_custom_var index- Track a non-interactive custom event

* Track ecommerce transactions

        g = Gabba::Gabba.new("UT-6666", "myawesomeshop.net")
        g.transaction("123456789", "1000.00", 'Acme Clothing', '1.29', '5.00', 'Los Angeles', 'California', 'USA')