New method to post events from UDP packets to payloads
Changes asked by Conor and Matt

Just don't know what to log when response from http connect
Fixes: #852
Old submit_events function removed

Fixes: 852
date_happened removed from event keys

Only timestamp now
Fixes: # 852
Events are sent in separate payloads if they are too many

Fixes: #852
Removed print

Fixes: #852
Merge branch 'master' into udp_events_cleaned
Changes in dict keys for event tests

Fixes: #852
Removed old batching function

Fixes: #852
Changed some old key names into new ones

Fixes: #852
More key changes

Fixes: #852
Nipticks solved

Fixes: #852
Merge pull request #852 from DataDog/udp_events_cleaned

New method to post events from UDP packets to payloads