Modify travis build to use GitHub tarballs

Instead of cloning and checkout, just grab the appropriate tarball
from GitHub.
Merge pull request #222 from bharrisau/nightly100

Issues from extension trait changes
Merge pull request #223 from bharrisau/target-specs2

Update target-specs for executable files
Merge pull request #224 from bharrisau/travis2

Modify travis build to use GitHub tarballs
Get Cargo working for the zinc rlib
Moving items around