Enable wheel builds

[sklam]

• Add a C-extension stub to make bdist_wheel build an arch dependent build

[coveralls]

Coverage remained the same at 93.55% when pulling 53b9deb on sklam:enable_wheel into c996fb6 on numba:master.

[codecov-io]

Codecov Report

Merging #222 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #222   +/-   ##
=======================================
  Coverage   91.84%   91.84%           
=======================================
  Files          33       33           
  Lines        4709     4709           
  Branches      329      329           
=======================================
  Hits         4325     4325           
  Misses        308      308           
  Partials       76       76

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[coveralls]

Coverage remained the same at 93.55% when pulling 25995ad on sklam:enable_wheel into c996fb6 on numba:master.

[seibert]

Note that the latest conda build (currently in the conda-canary channel) also has the ability to make wheels.

[sklam]

Docs on wheel feature: conda/conda-docs#388

[coveralls]

Coverage remained the same at 93.459% when pulling b477089 on sklam:enable_wheel into 255964d on numba:master.

[sklam]

I have a linux 64-bit wheel package for testing at

pip install -i https://pypi.anaconda.org/sklam/simple llvmlite

[sklam]

I have uploaded new manylinux1 wheels based on the merged branch of this PR to v0.16.0.