Make level optional in setColor

[joshualyon]

The level property of the COLOR_MAP used in setColor should be optional. Fallback to the current device level if it's not supplied in the map.

[joshualyon]

I originally made this as a change directly on your main branch along with a version bump to 0.3.2 in the comment header and packageManifest.json, but realized you were already working on some changes in your development branch, so I simplified to just the code change and pointed it at this branch.

Feel free to just manually incorporate it if you prefer. 😄