Add libvlfeat1 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#3034
Add libvlfeat1 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#3034

Packages: libvlfeat1 libvlfeat-dev libvlfeat1-dbg libvlfeat-doc octave-vlfeat

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