Add an option for no compression in RPMs.
Only convert the dashes in version if it exists.
Merge pull request #399 from quiffman/version-not-nil

Only convert the dashes in version if it exists.
Merge pull request #398 from quiffman/rpm-compression-none

Add an option for no compression in RPMs.
- disable travis; it's too noisy and I don't have time to keep it happy
right now. I will worry about tests passing on the next release.
- Represent '!=' version deps as Breaks, not Conflicts (#400)