Fix conda build --help in Python 2.
Fix conda build --help in Python 2.

Fixes #502.

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