Tests for accum with more than one dimension
accum correction for cases with more than one dimension
Random seed case for which test_unfold fails
Corrections in sptensor and test case to avoid test_unfold failure
Correct test_ttv: sparse tensor should return only nonzero vals
Optimized sptensor creation when result is vector-like
Further improvement in sktensor when result is vector-like: avoid allocation of large arrays by bincount
Merge pull request #4 from panisson/sptensor-fixes

Sptensor fixes