Add libargtable2-dev to ubuntu-precise; resolves travis-ci/apt-package-whitelist#3005
Add libargtable2-dev to ubuntu-precise; resolves travis-ci/apt-package-whitelist#3005

Packages: libargtable2-dev libargtable2-docs libargtable2-0

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