ENH: add original quantile_regression
DOC: first example for quantilereg
DOC: sandbox examples quantile regression: move first, add new
STY: add whitespace, fix some undefined objects in unused code (pylint)
REF: some code comments, adjustments in unused code
REF move and rename quantreg
ENH: quantreg initial
bug
new kernels
bandwidth
add engel dataset for quantreg tests
add date
parzen kernel
np.percentile -> stats.scoreatpercentile
references
quantreg tests
parzen fix
epanechnikov test
bandwidth + sparsity attributes
ipynb example