Fix "successful" typos

A number of s/succesful/successful/ across the tree. There is also a
"successfull" typo in a comment in snappy.c but in the interest of not
creating spurious diffs with a third-party upstream, this was left alone
deliberately.
Fixed uninitialized variable warning
Removed outdated C++ example
Added consumer documentation to INTRODUCTION.md
Proper fallthrough for -X "topic." properties
Periodic metadata requests could occassionally be flooded.
Add support for auto-creating topics on broker (issue #22)

This requires "auto.create.topics.enable=true" to be configured on the
brokers.

The automatic topic creation trigger (a topic-specific metadata request)
is performed every second, as well as immediately when a new topic is added
if at least one broker is up.
Clarified comment
Removed unused compression argument to rd_kafka_op_reply*
Added statistics emitter

An application may subscribe to librdkafka statistics by setting
the "statistics.interval.ms" configurarion property to non-zero and
registering a stats callback that will be called from rd_kafka_poll().

The statistics is JSON encoded.
Less noisy 0001 test
Regression test results are now color coded
Regression tests: honor TEST_LEVEL env variable
Added statistics support (-T) to rdkafka_performance
Added quiet flag (-q) to rdkafka_performance
Better handling when running rdkafka_performance in "forever" mode (no -c ..)
Updated README with statistics info and node-kafka
Merge tag '0.8.0' into debian
Update Debian symbols for 0.8.0

Update with a few last-minute changes to symbols. Also, s/0.8/0.8.0/ as
this is the release version after all.
Update d/changelog for 0.8.0-1