Initial support for global properties.
Tests working.
Add some documentation.
Refactor APIs under ProxyClient: request, response, HTTP service
Transaction API
Merge pull request #99 from alxhub/entity-global

Global property support for generated entities.
Fix syntax typo in wrapper.dart
Fix expand in _ObservableImmutableListView
Fix signature of invalidate in CachingFlagCacheWrapper
Remove obsolete namedArguments workaround in DynamicEntity
Declare library in streamy_test.dart; missing declaration causes compiler warnings;
Add missing _freeze() and isFrozen in EmptyEntity and _ErrorEntity
Merge pull request #107 from yjbanov/fix-typo-in-wrapper

Miscellaneous fixes: one for a show-stopping typo, the rest are compiler warnings clean-up
Replace uses of (deprecated) StreamEventTransformer with StreamTransformer
Bump quiver dependency to v0.11.0
Merge pull request #108 from cbracken/sdk-updates-0850

Updates for breaking changes in Dart SDK
Checkpoint for Response and Tracer: most tests passing.
Checkpoint for global implementation.
Tests working via .global.
More tests working.