PIG-4000: Minor documentation fix for PIG-3642 (lbendig via cheolsoo)


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PIG-3999: Document PIG-3388 (lbendig via cheolsoo)


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Move deleting zebra to incompatible changes


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PIG-3998: Documentation fix: invalid page links, wrong Groovy udf example (lbendig via cheolsoo)


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PIG-3997: Issue on Pig docs: Testing and Diagnostics (zjffdu via cheolsoo)


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Preparing to release 0.13.0

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Adding public key for Aniket Mokashi to KEYS

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