Merge pull request #348 from sawano/1.3.x

1.3.x Allow for @HystrixCommand to be used on parameterized return type
[Gradle Release Plugin] - pre tag commit:  '1.3.19'.
[Gradle Release Plugin] - new version commit:  '1.3.20-SNAPSHOT'.
RxJava 1.0.x
Update CHANGES.md
RxJava 1.0.2

We can't have dynamic versions with this build system.