Add an event parser

[josegonzalez]

This event parser may also be configured to leave out certain keys as specified in the config file.

[josegonzalez]

As mentioned in 063e3b2, it would be best to leave the heavy-hitting to the big boys. While it would be nice to have events preparsed, I think the overhead of a class is just wayyy too much. Perhaps just allowing grok-like functionality would be possible, but I don't think it's worth it at the moment.