NUTCH-2481 HostDatum deltas(previous step statistics) and Metadata expressions#278

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okedoki wants to merge 10 commits intoapache:masterfrom

okedoki:NUTCH-2481

Commits on Jan 17, 2018

Commits on Jan 19, 2018

addition for NUTCH-2481 delta expression. Now expressions can return both (strng,number) and (string, string) pairs
okedoki
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Commits on Jan 22, 2018

NUTCH-2481. Changed the descprition of hostdb.deltaExpression in the config. Now the format of the return key can be either Number of String
okedoki
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Merge branch 'master', remote branch 'origin'
okedoki
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Commits on Jan 25, 2018

Merge remote branch 'origin/master'
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Commits on Feb 12, 2018