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Fast Numerical Linear Algebra Library for Ruby. NMatrix reimplementation.

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Added `sum` instance method in the elementwise module and associated tests in elementwise_test.

Currently, there is only benchmarking code for basic operations. There needs to be benchmarks for other operations such as iteration, indexing, linear algebra etc.

Marshalling in Ruby, Pickling in Python

Add support for `datetime` dtype. @v0dro, How does `daru` support it ?

enhancement

Implement `NumRuby.triu(matrix)` and `NumRuby.tril(matrix)`.

See: https://docs.scipy.org/doc/numpy-1.13.0/neps/ufunc-overrides.html