Add hscolour to ubuntu-precise; resolves travis-ci/apt-package-whitelist#1167
Add hscolour to ubuntu-precise; resolves travis-ci/apt-package-whitelist#1167

Packages: hscolour libghc-hscolour-dev libghc-hscolour-prof libghc-hscolour-doc

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