We have just completed another repo split. This time @carbonin has extracted the ManageIQ replication code into the https://github.com/ManageIQ/pg-pglogical repo. Because of this, we have been able to run a special setup on Travis to validate that replication actually works between 2 installations of PostgreSQL. Additionally, we have been able to remove another test suite (replication) from the ManageIQ repo, bringing the number of suites down to 4.
If you would like to contribute to the replication code, now it should be much easier for you to create Pull Requests in this isolated repo.
If you have any questions, please ask them here.