update url for hsb2 dataset
tools/check_dirs print only dirs with .py files
ENH: compat add collections.Counter
STY: various pylint cleanups (for moment_helpers see #703)
REF/STY: qsturng rename: same module and function name
BUG: Fix one regressor case for conf_int. Closes #706.
BUG: Handle scalar case for attach_columns
BUG: summary, use correct alpha, closes #707
Merge pull request #708 from jseabold/fix-706

BUG: Fix one regressor case for conf_int. Closes #706.
BUG: problem with fsolve scipy > 0.9, check fvec with hardcoded precision, closes #710
BUG: kernel_base _compute_efficient, error in non-joblib path closes #673
Merge pull request #711 from josef-pkt/misc06

Misc06 - bug fixes
REF: Remove _pandas_mapping freq dict
ENH: Remove unneeded freq check
TST: Test pandas freq strings
TST: Test freq of predicted dates
BUG: Handle freq is None
STY: Don't catch exception in old-style way
Merge pull request #668 from jseabold/tsa-freq

Allow for any pandas frequency to be used in TimeSeriesModel. Closes #319.
ENH: Handle freq=None and improve errors in get idx.