Rikorose/gcc-cmake

use jessie-backports to upgrade CMake 3.6

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CMake 3.0 is not so recent package. Fortunately jessie-backports offer CMake 3.6. It will be awesome if this image supports CMake 3.6.

I am not familiar with the backports repo.

I guess the dockerfile should look like this:

FROM gcc:6

RUN deb http://ftp.debian.org/debian jessie-backports main \
  && apt-get update && apt-get -t jessie-backports install -y --no-install-recommends \
         cmake \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*