Merge pull request #29 from escherba/dev

test hd clustering on simulated data set
Merge pull request #30 from escherba/dev

add hd clustering back to lsh.cluster
fix thresholds
do it right
final commit for this branch
make all tests pass
Merge pull request #31 from escherba/n_fix_thr

add min_support
change docstring
remove comment
add text cleaning/normalization from feat_extract
add clustering script
rename core module to lsh_hdc