Add encrypted keys for Sonatype/Bintray (#116)
Add encrypted keys for Sonatype/Bintray (#116)

***Problem***
The Maven Central synchronization is not working (Travis CI is building the jars, but can't copy them to maven central).

***Solution***
This is the result of removing the previously encrypted keys, and running this script (authenticated as ReactiveSocketAdmin).

```
travis encrypt bintrayUser=*** --add
travis encrypt bintrayKey=*** --add
travis encrypt sonatypeUsername=*** --add
travis encrypt sonatypePassword=*** --add
```
somasun/reactivesocket-java,yschimke/rsocket-java,qweek/rsocket-java,rsocket/rsocket-java,qweek/rsocket-java,ReactiveSocket/reactivesocket-java,yschimke/rsocket-java,NiteshKant/reactivesocket-java,NiteshKant/reactivesocket-java,ReactiveSocket/reactivesocket-java,somasun/reactivesocket-java