Added context containing GA cookie values (closes #253)
Added context containing GA cookie values (closes #253)

YieldifyLabs/snowplow-javascript-tracker,juliomenendez/snowplow-javascript-tracker,fivetran/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,YieldifyLabs/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,juliomenendez/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker,fivetran/snowplow-javascript-tracker,YieldifyLabs/snowplow-javascript-tracker,juliomenendez/snowplow-javascript-tracker,fivetran/snowplow-javascript-tracker,snowplow/snowplow-javascript-tracker