bdist_conda: automatically lowercase the name
bdist_conda: automatically lowercase the name

See the discussion at https://github.com/aplpy/aplpy/pull/259. Initially I did
not want to do this (see 0a63cb37ecdc04c7a2a8b9270e536d836088dbd3), but since
the same metadata item is used for both PyPI (which allows uppercase letters)
and conda, it does not make sense to require package authors to lowercase
their package names just for bdist_conda.

Other restrictions, such as requiring versions to not have dashes, will still
still on the package authors to fix and not be fixed automatically by
bdist_conda.

shastings517/conda-build,rmcgibbo/conda-build,dan-blanchard/conda-build,frol/conda-build,ilastik/conda-build,shastings517/conda-build,frol/conda-build,mwcraig/conda-build,ilastik/conda-build,rmcgibbo/conda-build,frol/conda-build,dan-blanchard/conda-build,dan-blanchard/conda-build,rmcgibbo/conda-build,mwcraig/conda-build,sandhujasmine/conda-build,sandhujasmine/conda-build,ilastik/conda-build,shastings517/conda-build,sandhujasmine/conda-build,mwcraig/conda-build