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

+280-175

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
committed

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
committed
Merge branch 'master', remote branch 'origin'
okedoki
committed

Commits on Jan 25, 2018

Merge remote branch 'origin/master'
root
committed

Commits on Feb 12, 2018