Change travis testing - fix various extra package installation - preliminary work on ie

[drosofff]

Sorry for the patchy PR, I have been working on GKS erratically.

In summary the PR:

• changes the travis testing: 2 builds are performed in parallel, one with the previous docker environment, and one in the VM Ubuntu 14.04 of travis. Note that a hook from docker registry build a docker galaxykickstart image as before.

• reduces the galaxykickstart tool list to a single tool.

• add encrypted: "yes" to postgresql_object_users variables - this is required under ubuntu 16.04

• collects host_external_ip to add it to galaxy.ini (ftp_upload_site variable). This is required to get the ftp panel showing up in the upload menu.

• prepare the installation of interactive environment by the GKS playbook. Not optimal yet, but I will re-comment all the involved variables before this PR is merged.

• awaits for 2 PR in ansible-galaxy-extras (https://github.com/galaxyproject/ansible-galaxy-extras/pull/175 and https://github.com/galaxyproject/ansible-galaxy-extras/pull/177)

• I will also put back the galaxy_manage_trackster to true before merging. This was for development.

[mvdbeek]

This looks pretty good now, I think you only have to set BIOBLEND_GALAXY_URL to http://127.0.0.1:80 in the ansible case!

[drosofff]

:tada: :satisfied:

[drosofff]

Thanks Marius, I will merge soon. Maybe wait for https://github.com/galaxyproject/ansible-galaxy-extras/pull/175 to stay on the main galaxyproject ansible stack