`systemd` in openSUSE 12.2 complains if service does not contain `.service`
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Fail if installing EPEL also fails
Use the Fedora URLs to install EPEL
Properly detect openSUSE with `lsb_release`. Fixes #430.
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Simplify (`-eq` || `-gt`) into `-ge`.

Thanks @cingeyedog for pointing this out.
Drop the `tsflags` requirement for RHEL and RHEL based distributions
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