Use the correct id when unsubbing a Topic
Simplify core/Topic
Merge pull request #105 from megawac/unsub-topic

Unsubscribe from topic
Fix typos pointed out by @T045T in #110
Merge pull request #106 from megawac/unsub-topic

Fix typos from #105
Make source files UMD compliant
Refactor tests to support node
Rewrite install and build steps. Configure travis
Example advantage: Use an Object.assign shim
Rebuild dist files
Simplify setup in readme; change websocket dep