Stable release with @observer

As of now, the following has been added:

• Fix a critical issue where multiple autorun() functions cannot be triggered correctly
• Implement observer annotation for React components
• Add three examples to demonstrate the usage of this demo MobX lib with React (with observable and observer), examples are
  1. Counter
  2. Todo List
  3. Advanced Todo List
• Add support for remove() method in ObservableArray
• More comprehensive unit tests

This release improves stability to a large extent and is tested with more comprehensive test cases, including integration test with real React components.

[v0.0.1-alpha] First Release

As of now, the following has been implemented:

• observable annotation supporting primitive values, arrays, and objects
• autorun() function which gets triggered when corresponding observable(s) is changed
• autorun function is now disposable
• Include unit tests

After working on this for a while, I think this is the reasonable point to have the very first release. The project at this point should be good enough for demo usage.