Mdr extractor#65

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tpeng wants to merge 5 commits intoscrapy:masterfrom

tpeng:mdr-extractor

Commits on Aug 20, 2014

add MDR extractor
tpeng
committed

Commits on Aug 27, 2014

Commits on Sep 11, 2014

change the MDR output to a dict with key as group name and value as a list of dict
tpeng
committed

Commits on Sep 17, 2014

fix MDRExtractor when some elements are not aligned in the seed record
tpeng
committed