Added the ability to set a callback function to automatically receive frames as they come in.
Added a more in-depth callback system. Now every mailbox can have its own callback which essentially allows callback based on filter. There is a new example to show how this works.
Added proper documentation both in the source and in a separate howto file. Also, made it so that callbacks disable buffering (sort of...)
Small fix so that callbacks don't corrupt the buffer for buffered/polled mode. Now both can be used at the same time. Any frames caught by callback will not be buffered.
Merge pull request #1 from collin80/master

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