added test stub to verify wire output for UDP
changed the constants to be attributes of the ConfigStruct
got rid of a bunch of variables from SentryOutputWriter and just put them on the stack
updated CEF plugin to use proper signature for PrepOutData
Merge branch 'vng/add_sentry' into vng/heka-docs-src
added a Deliver method so that the plugin will actually startup
added some comments to that it's clear why Deliver would not be safe
to use in the UdpOutput function