Add tidy to ubuntu-precise; resolves travis-ci/apt-package-whitelist#940
Add tidy to ubuntu-precise; resolves travis-ci/apt-package-whitelist#940

Packages: tidy libtidy-0.99-0 libtidy-dev tidy-doc

AlCutter/apt-package-whitelist,jmerkow/apt-package-whitelist,christophgysin/apt-package-whitelist,phw/apt-package-whitelist,phw/apt-package-whitelist,AlCutter/apt-package-whitelist,jmerkow/apt-package-whitelist,travis-ci/apt-package-whitelist,christophgysin/apt-package-whitelist,travis-ci/apt-package-whitelist