Migrate jbosstools-4.1.x and master branches to use Tycho 0.19.0

With the release of Tycho 0.19, we should explore moving up to that in our parent pom, Locus, and TP builds.

Tycho milestone 0.19.0 has been released and is available from maven central.

See the release notes [1] for details of enhancements and bug fixes in this release.

Thanks to Mickael Istria, Nepomuk Seiler, Roland Grunberg, and Thanh Ha who contributed patches for this release.
And thanks and to everyone who helped us with testing the staged version.

Regards,
Tycho team

[1] http://wiki.eclipse.org/Tycho/Release_Notes/0.19