Creating branch for kafka-0.8.0-incubating that will include all replication related changes

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KAFKA-202 Make request processing in kafka asynchronous; patched by jaykreps; reviewed by junrao and nehanarkhede

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Checking in some files left from the last checkin for KAFKA-202

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create/delete ZK path for a topic in an admin tool; patched by Jun Rao; reviewed by Neha Narkhede; KAFKA-237

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trivial fix to make create topic script executable

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KAFKA-238 getTopicMetadata API; patched by nehanarkhede; reviewed by junrao

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Merging commits 1230840:1239902 from trunk

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refactor the async producer; patched by Jun Rao; reviewed by Neha Narkhede; KAFKA-253

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new consumer request format; patched by Prashanth Menon; reviewed by Jun Rao and Jay Kreps; KAFKA-240

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disable dup topic in consumer request; patched by Prashanth Menon; reviewed by Jun Rao; KAFKA-240

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KAFKA-239 Refactoring code to wire new ZK data structures and making partitions logical; patched by Neha Narkhede; reviewed by Jun Rao

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KAFKA-240 ProducerRequest wire format protocol update and related changes

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KAFKA-240 missing producer response

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Add acknowledgement to the produce request; patched by Prashanth Menon; reviewed by Jun Rao; KAFKA-49

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KAFKA-300 Leader election; patched by nehanarkhede; reviewed by junrao

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KAFKA-307 Refactor server code to reduce interdependencies; patched by nehanarkhede; reviewed by junrao

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SyncProducer does not correctly timeout; patched by Prashanth Menon; reviewed by Jun Rao, Neha Narkhede; KAFKA-305

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KAFKA-320 testZKSendWithDeadBroker fails intermittently due to ZKNodeExistsException; patched by nehanarkhede; reviewed by junrao and prashanth menon

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KAFKA-301 Implement broker startup procedure; patched by Neha Narkhede; reviewed by Jun Rao and Jay Kreps

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KAFKA-48 Patch to add "long poll" support to fetch requests. 



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