Initial release (v0.1)

This release introduces einops, as well as its notion.

Initial release API:
Operations (ops)

• einops.rearrange and einops.reduce

Auxiliary

• einops.asnumpy and einops.parse_shape

Layers (for chainer, gluon, keras and torch)

• Rearrange and Reduce

Supported frameworks:

• numpy
• pytorch
• tensorflow eager
• cupy
• chainer
• gluon
• tensorflow
• mxnet (experimental)
• and keras (experimental)