disposable 0.2.2

An implementation of disposable for Dart.

0.2.2

• Fix a bug in CompositeDisposable.add.
• Change the return type of CompositieDisposable.remove() to bool.

0.2.1

• Add Disposable.from factory constructor.

0.2.0

• Removed I prefix from IDisposable and IAsyncDisposable.
• Added RefCountDisposable, MultiAssignmentDisposable, SingleAssignmentDisposable and SerialDisposable.
• Introduced new constructors to Disposable/AsyncDisposable.
• Hide noop field of Disposable.
• Changed to throw an ArgumentError when null argument is given.
• Added length property to CompositeDisposable.
• Extracted AsyncDisposable and usingAsync as a separate library.
• Cleaned-up API documentation.