NUTCH-1781 Update gora-*-mapping.xml and gora.proeprties to reflect Gora 0.4

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Temporary disable TestGoraStore due to GORA-326 Removal of _g_dirty field from _ALL_FIELDS array and Field Enum in Persistent classes

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NUTCH-1788 Tika may return multiple values for Title on PDF's

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Fixing blunder in Nutch-1781

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NUTCH-1782 NodeWalker to return current node


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NUTCH-1736 Can't fetch page if http response header contains Transfer-Encoding：chunked

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 NUTCH-1590 [SECURITY] Frame injection vulnerability in published Javadoc (jnioche)

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NUTCH-1796 Ensure Gora object builders are used as oppose to empty constructors

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NUTCH-1718 redefine http.robots.agent as "additional agent names"

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NUTCH-1767 remove special treatment of "params" in relative links

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NUTCH-1787 update and complete API doc overview page

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NUTCH-1633 slf4j is provided by hadoop and should not be included in the job file (kaveh minooie via jnioche)

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NUTCH-1769 REST API refactoring

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Merge remote-tracking branch 'origin/2.x' into 2.x-dev