Travis-CI install higher version of cmake
Travis-CI install higher version of cmake

While the libchewing requires cmake version equal or higher then
2.8.8, but the default cmake version in Travis-CI is 2.8.7.
Install cmake from kalakris/cmake for higher version

hiunnhue/libchewing,hiunnhue/libchewing,hiunnhue/libchewing,chewing/libchewing,yan12125/libchewing,yan12125/libchewing,chewing/libchewing,hiunnhue/libchewing,yan12125/libchewing,chewing/libchewing,hiunnhue/libchewing,chewing/libchewing,yan12125/libchewing