Some improvements

Just a few "improvements" that I've done for talk.getindico.io and would like to contribute back:

• Using persistent volume for backups;
• Using Postgres 9.6 (needed for backups to work);
• Deleted image assets (the template is suppose to be generic);
• Put all pods under "discourse" label;
• Missing newlines;
• Updated Discourse to latest stable version;

changed title from Master to Some improvements

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BTW, could we rename the repo to something like discourse-openshift?

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• f2e863f8 - Use Postgres 9.6

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• 2b448750 - Fix issue with ConfigChange trigger

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• 300ceff0 - Move backups to persistent storage

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mentioned in commit 8531b96d

merged