Update setup

[ColCarroll]

Description

This adds all the requirements to run the project into the setup.py. It seems unlikely this gets installed without separately installing numpy, scipy, etc, but still good practice! I am not a conda expert, but it might also be best to change the travis setup to just make a clean environment, then run pip install ., so that the requirements truly only need to be specified in one place.

Related issues or pull requests

Discussed in #302.

Pull Request requirements

• Added appropriate unit test functions in the ./mlxtend/*/tests directories
• Ran nosetests ./mlxtend -sv and make sure that all unit tests pass
• Checked the test coverage by running nosetests ./mlxtend --with-coverage
• Checked for style issues by running flake8 ./mlxtend
• Added a note about the modification or contribution to the ./docs/sources/CHANGELOG.md file
• Modify documentation in the appropriate location under mlxtend/docs/sources/ (optional)
• Checked that the Travis-CI build passed at https://travis-ci.org/rasbt/mlxtend

[coveralls]

Coverage remained the same at 90.967% when pulling dcb332f on ColCarroll:update_setup into c1100c9 on rasbt:master.

[rasbt]

Thanks again, that's a pretty good solution to keep the requirements.txt and setup.py in sync! Good idea also regarding the travis installs. I will make a new issue as a reminder to take a look at this! Thanks!

[ColCarroll]

thanks for the useful project, doctor!