Fix RestClient connection leaks when it throws ClientException upon server throttle. Enhanced JUnit tests for RestClient retries.

Fix RestClient connection leaks when it throws ClientException upon server throttle. Enhanced JUnit tests for RestClient retries.

Upgrade httpasyncclient version to 4.0 GA. Added concurrency and read timeout tests.

In JUnit, make sure connection pool size is equal to concurrency level to avoid timeout from connection pool.

Add async HTTP support based on Apache's HttpAsyncClient

Add internal buffering to any unconsumed data by the decoder so that decoder does not need to repeat the boilerplate code to buffer unconsumed data. Changing the JUnit tests and examples correspondingly.

Add more locks to AsyncBackupRequestExecutor to make it run consistently across implementations.

Clean up compiler warnings. Remove dependency on jersey-bundle and add dependency on jersey-client and separate jars.

Remove check style. Make connection pool test in separate test and use a unique client name to avoid reusing the same client in another test.

Junit test update as CloudBee build server seems to have different behavior to outside network connection.

Fix junit failure: set exception or response first before latch count down so that Future.get() will return correct object.

Conflicts:
	gradle.properties

Added Http async interfaces to hide generic types for convenience. Added more examples. Execution with back up requests factored out to a standalone class.

Rename test. Added getExecutedURI() to query the host where the actual execution happens for parallel execution with back up requests.

Added more API to query executeWithBackupRequests() results. Make sure cancel works correctly. Close the consumer as part of response.close().

Added LoadBalancerErrorHandler and provided default implementation and one for httpasyncclient. Move HttpResponse class to desired package.

Added examples sub project. Changed the serializer interface to use OutputStream. Make Response and AsyncClient extends from Closeable.