test framework that uses real Twitter data
add --pyargs to quacreduce
better quacreduce features blurb
use pformat() instead of sorted() for tests in u.py
use raw tweets for test set (closes #55)
optional argument of arguments to parse
typo in test
use u.ArgumentParser in json2rawtsv
tab-separated input and pickle sequence output
fix broken sort (sigh)
ngrams-build runs without crashing
implement u.glob_maxnumeric()
helper function to format datetime as ISO 8601 date
ngrams-search and a time series test
move quacreduce guts into module for use by other scripts
make JOBDIR an optional argument

This is so ngrams-build can use qr.scripting more effectively.
use new qr.scripting in ngrams-build
fix test to reflect change to unicode keys
metadata includes only date range in data (closes #59)
don't hash trailing newline if no tab present