Make component-info recognize local paths instead of always hitting remotes

These changes go hand in hand:

### Local path awareness

    component info ../some-component scripts

### "-u, --unix" option

Useful for feeding style and script dependencies into custom build systems

    component info -u . styles | xargs redo-ifchange

I'm not sure if there are any plans to support paths at the lib level but I couldn't see any way to do it without making a lot of changes.