Add support for tagged releases to GitHub Releases
Add support for tagged releases to GitHub Releases

First, run test suite inside of a Scala container (Java 7). If the tests
pass, use the same container image to build an assembly JAR. Finally, if
commit is associated with a tag, use the Travis CI deployment support
for GitHub Releases to publish the assembly JAR.

kdeloach/raster-foundry-tiler,kdeloach/raster-foundry-tiler