Revert "Fix JSON encoding issues"

Reverts kaazing/robot#31

Test failures

```
Tests in error: 
  shouldEncodeStartedMessage(org.kaazing.robot.driver.control.handler.HttpControlResponseEncoderTest): unexpected invocation
  shouldEncodeErrorMessage(org.kaazing.robot.driver.control.handler.HttpControlResponseEncoderTest): unexpected invocation
  shouldEncodePreparedMessage(org.kaazing.robot.driver.control.handler.HttpControlResponseEncoderTest): unexpected invocation
```