TileValidator is now run at tile attach time.

The release of a tile is now validated for buildSmells before
allowing a release to go ahead.

Change-Id: If719b83adf2f52cbf1013af3eb23622dea366944
Updated @author tags for Mark

Change-Id: I25b79b31b790e3bd3c7e75bd08b78bb126d2bf17
[maven-release-plugin] prepare release tiles-maven-plugin-1.4

Change-Id: I5c44dd706cdb8eb139f5347bd53dae7d43d0be7e
[maven-release-plugin] prepare for next development iteration

Change-Id: I53b6f835f762d90281473a2610ea21026303f295