Fixed IRC channel and typo in README
Correctly handle IPv6 broker addresses added by application (issue #23)
Updated 0.8 status in README
Let produce API honour "message.max.bytes" (issue #24)

Producing a message larger than "message.max.bytes" will now make
rd_kafka_produce() return -1 and set errno to EMSGSIZE.
Producer msg count was increased if msg was too large (for issue #24)
0003-msgmaxsize: test case for message sizes (issue #24)