Add libimobiledevice6 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#3000
Add libimobiledevice6 to ubuntu-precise; resolves travis-ci/apt-package-whitelist#3000

Packages: libimobiledevice6 libimobiledevice-dev libimobiledevice6-dbg python-imobiledevice libimobiledevice-utils libimobiledevice-doc

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