Merge pull request #1 from harbour/master

pulling upstream changes to fork
Merge https://github.com/harbour/core
Merge https://github.com/harbour/core
Created .travis.yml build-control
c -> clang
travis: added clang, enabled libmagic
travic: gcc only

log doesn't seem to appear with dual builds
travis: minor
Merge pull request #4 from vszakats/master

enabling automatic build tests on travis-ci.org