Fix requirements (Teichlab#284)

* Fix pandas dependency, pinned to `pandas>=1.0.0,<=1.1.4` to prevent 'pandas.errors.InvalidIndexError: Reindexing only valid with uniquely valued Index objects'. 
* Add min version for numpy<=1.16.5 to match pandas requirement. 
* Remove unused cython requirement.
* Add README.md and requirements.txt to package MANIFEST.in
* Bump package version and add short description to setup.py

Allow .h5ad, .h5 and mtx as input and fix requirements (Teichlab#264)

* Update utils.py to include `_read_mtx`, `_read_h5ad` and `_read_h5`
* Update `method_launcher.py`
* Update `cpdb_statistical_analysis_helper.py` and `cpdb_statistical_analysis_complex_method.py`
* Requirements: drop pandas versions (fix compatibility with python versions); add numpy, h5py and anndata; for now scikit-learn (geosketch dependency); remains fixed at 0.22 until further testing of geosketch v1.2
* Update `requirements.txt` and `win-requirements.txt` and  make `setup.py` pickup requirements from requirements.txt


Co-authored-by: @prete

Code Refactor and optimizations

Released new version 2.1.4

minor fixes

added cython to requirements

Merge pull request Teichlab#118 from Teichlab/develop

Develop

Merge pull request Teichlab#116 from Teichlab/develop

Develop

Release v2.0.6

Merge pull request Teichlab#97 from Teichlab/develop

Develop