Clone git sources with --recursive option
Clone git sources with --recursive option

This allows specifying a source as a git repository for projects using
git submodules, as IPython does.

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