adjust coveragerc to skip @jit functions

[mmcky]

This PR adjusts the coverage rc file to adopt custom regex exclusions to make coverage statistics more useful in diagnosing code that isn't covered by tests.

This will help with PR #302

[coveralls]

Coverage increased (+7.8%) to 90.805% when pulling 6792ec7 on update-lemke-howson-test into 758620a on master.

[coveralls]

Coverage increased (+6.4%) to 89.481% when pulling 6792ec7 on update-lemke-howson-test into 758620a on master.

[mmcky]

Many @jit functions are used within a wrapper function that is tested. As long as each support jit function is tested through the parent function (either directly, or via a kwarg option) then I don't see a problem with this PR as it provides more accurate coverage statistics. It does however mean that we would need to ensure @jit(nopython=True) functions are fully tested manually.

I welcome feedback on this proposal.

A good example of this is contained in Issue #302

[oyamad]

Thanks @mmcky.

The alias @njit should also be excluded.

[mmcky]

Thanks @oyamad. good pickup.

[coveralls]

Coverage increased (+6.9%) to 89.889% when pulling 6cc03e9 on update-lemke-howson-test into 758620a on master.