Merge pull request #2 from Wikidata-lib/correctAttributePairCounting_1

#1 avoid counting attribute pairs with 2 equal attributes
add xml reader and csv reader/writer
add test
add datatype to output
fix comments
Merge pull request #4 from Wikidata-lib/importer

Importer
add args
add nosetests
add timing
use multithreading for json parsing
test multithreading
small fixes
Merge pull request #5 from Wikidata-lib/importer

add args to CsvWriter
add better handling for compressed files
fix problems with big dump
fix whitespace
remove debug code
reader support for 2nd csv format
Merge pull request #6 from Wikidata-lib/importer

add better handling for compressed files
fix pool termination