Updates in setup.py for pypi installation

[lasofivec]

Cleaned the setup.py and other config files in order to make installation via pip install tofu work without imposing a previous installation of Cython or numpy or having to add pre-compiled files. Seems to be working on sample project (https://github.com/lasofivec/sampleproject).

Added wheel packaging in travis CI.

Left requirements.txt even if unnecessary.

[pep8speaks]

Hello @lasofivec! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file setup.py:

Line 27:1: E303 too many blank lines (3)
Line 27:80: E501 line too long (80 > 79 characters)
Line 33:80: E501 line too long (80 > 79 characters)
Line 145:80: E501 line too long (80 > 79 characters)

Comment last updated at 2019-11-26 16:20:34 UTC