build-locally.py has side effects that interfere with submitting new recipe

[areeda]

Bug:

@conda-forge/staged-recipes

I am submitting my first new recipe although I have helped maintain existing packages.

Problem:

When running build-locally.py it modifies the branch by deleting the the example and pypromice directories and adds a path on my local computer to .ci_support/osx64.yaml

-CONDA_BUILD_SYSROOT:
-- /data2/opt/MacOSX10.9.sdk

These changes make my branch problematic

Suggestions:

The easiest solution I can think of is to update the documentation to suggest that we create a temporary branch before running build-locally.py .

Now that I know about this it is no longer even an inconvenience for me.