Feature/multiple platforms

[r-peck]

WIP - Still needs documentation update for usage and parsing of list command output, but wanted to get the functionality under review.

Implements #36. Platforms can be specified with the --platform option (rome upload --platform ios,watchos). The cache key is now <framework_name>/<platform>/<framework_name>.framework-<version>.zip.

When using the list command, the output format has been updated to <git-repository-name> <version> : ((+|-)<platform-name>){1-4}, for example FrameworkA 1.0.0 : +iOS -watchOS

[tmspzz]

Thanks, I'll start reviewing ;)

[tmspzz]

I have submitted a pull request to your branch.

[tmspzz]

See changes in pull request to your pull request

[tmspzz]

@r-peck Will do you a separate pull request for the README.md ? Do you also want to provide a sample script to parse the output of list?

These are the last two open issues.

[r-peck]

I am working to add both of those to this PR. Hoping to have that ready in the next day or two. Would you prefer a separate PR?

[tmspzz]

This PR would be the preferred way.

[r-peck]

@blender Updated the README to reflect the --platform option added a short example on parsing the output of list to a similar result to how rome list --missing might have been used before.

[tmspzz]

@r-peck Merged 🎉