Update Redline RPM library to version 1.15
expose the RPM signing functionality of the Redline RPM library
builder.setPrivateKeyRingFile needs a File object, not a String
Merge https://github.com/RiotGames/riot-redline-plugin into rpm-signing

Conflicts:
	pom.xml
Added dependency to the Bouncy Castle OpenPGP API (needed for RPM
signing)
Added dependency to Bouncy Castle Provider
Trying to fix the POM, revert from tabs to 4 spaces
Merge pull request #10 from TorstenS73/rpm-signing

Rpm signing