Remove previous files for development
Add DimensionReduction module in features.py
Modify description of features.py
Add kernel-related functions
Add RandomSample module in utils.py
Support multiple arrays as input to run sampling at the same time sharing the same delete seqeuences
Add random-sampling example in the kernel module
Load both dense/sparse matrix properly in kernel module
Add utils.GenerateDeleteIndexes() function, Add index_file option in utils.RandomSample()
Add comments about usage examples
Change description about FetchMongo in README
Add load/dump in features
Add toDense function in utils