dedupe.core.randomPairs instead of random.sample
Merge pull request #234 from chancyk/convenience_random_sample

replace pair enumeration logic with dedupe.core.randomPairs
performance tweaks for scoreDuplicates
updated c files within cython 0.20
performance improvements of scoreDuplicates and fieldDistances, breaks existing learned setttings
use numpy to do filtering
lower chunk size, and memory usage
adaptive chunk_size
localize functions
typo
merge in master
Merge branch 'pypi' of github.com:open-city/dedupe into pypi