use conda to get binary packages of numpy/scipy for travis
add a super class of all centerpoints algorithms
fixed pep8 test

the pep8 test didn't test the `./tests` directory
add radon point
Move cli to separate file.
Ignore setup.py generated output directories.
Restructure cli and add tests.
Add validation for point list types.
Merge pull request #3 from berleon/travis

use conda to get binary packages of numpy/scipy for travis
Merge pull request #5 from berleon/radon

Radon Points
renamed interfaces file
Merge pull request #4 from berleon/algo-interface

add a super class of all centerpoints algorithms
Merge pull request #6 from kleingeist/cli

Some changes to the cli interface and some tests