Batch event worker

[Grokzen]

This fixes issue #28

• Added support for a optional mode to send all queued up events at the same time to each worker instead of sending them one by one like the normal way of doing it.
• Updated changelog
• Added new example worker for this new batch mode.

[Grokzen]

It is ready for review and please test it out and see if there is any issues with it or not :]

Also before you merge this PR you should really sync up the develop branch with master so they are on the same commit because right now develop is behind master and if you merge this into develop then you will have to merge it to master and resolve any conflicts yourself :p

Also please remember to commit everything that is for the next upcomming release into develop branch so we can keep master branch clean. Then when you are done with development and want to tag a new release you can merge back to master branch and tag it there and package it for pypi and all that...