Add libmupdf-dev to ubuntu-precise; resolves travis-ci/apt-package-whitelist#866
Add libmupdf-dev to ubuntu-precise; resolves travis-ci/apt-package-whitelist#866

Packages: libmupdf-dev mupdf mupdf-tools

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