Extra pyc files included

[rmcgibbo]

I just looked at the contents of wget https://anaconda.org/omnia/mdtraj/1.5.1/download/win-32/mdtraj-1.5.1-np110py35_0.tar.bz2, and noticed that it contains a lot of extra pyc files from numpy and Cython that really shouldn't be there.

Lib/site-packages/Cython/Build/__pycache__/Dependencies.cpython-35.pyc
Lib/site-packages/Cython/Build/__pycache__/__init__.cpython-35.pyc
Lib/site-packages/Cython/Compiler/__pycache__/Annotate.cpython-35.pyc
Lib/site-packages/Cython/Compiler/__pycache__/Buffer.cpython-35.pyc
[... etc ...]

[jchodera]

Possibly related? conda/conda-build#686

[jchodera]

And this: conda/conda-build#715

I added an option to the build section where you can say:

pyc_compilation: False

and it will skip the pyc compilation step.

[rmcgibbo]

I filed conda/conda-build#718. I don't particularly want to turn off generation of all pyc files across the board. We do want the mdtraj's .pyc files. I just don't want to generate and include .pyc files for other packages that aren't part of our project.