Remove libtiff4-dev from apt-get install

Since Ubuntu 12.10, there is an updated version of `libtiff`, `libtiff5-dev` available. `libopencv-dev` depends on `libtiff5-dev`. Hence, the installation script generates a broken package error. Is including `libtiff` necessary in `apt-get install`, when installing `libopencv-dev` would automatically install the correct version?