working snow_degree_day setup

[Elchin]

I changed the parameter.json and hooks/pre-stage.py so that '.cfg' fills correctly.

[mdpiper]

This is close! There are only two changes that need to be made:

1. Please modify parameters.json to use the group key for the input parameters that take scalar, time series, grid, or grid sequence inputs. Using this format allows a user to upload a file. See the parameters file for the Meteorology component for an example.
2. Uncomment the call to assign_parameter_type_and_value in the pre-stage.py hook.

[mcflugen]

One more tiny change: remove the Mac .DS_Store file.

[mdpiper]

This looks good so far. A few points:

• Do a git pull before you start committing changes (and periodically as you're working on a project). This syncs your repo with the upstream repo. It tends to help avoid conflicts when multiple people are committing changes to a repo.
• Make smaller commits. This makes it easier to rewind if there's a problem. It may be overkill, but I often commit changes multiple times when editing a file, especially long ones like parameters.json.
• This is arguable, but perhaps also make smaller pull requests. For this repo, one PR per component would be natural. This helps to minimize the amount of code to review, and helps to catch recurring problems.