Add swig to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3587
Add swig to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3587

Packages: swig swig2.0 swig-examples swig2.0-examples swig-doc swig2.0-doc ccache

travis-ci/apt-package-whitelist,travis-ci/apt-package-whitelist