Closes#2279. Configures CMake to enable C++11, build static libaries
and only build cpp bindings with minimal dependencies. Documentation,
examples, tests and other language bindings are no longer built.
CMake will no longer try to find commands and packages which are not
required for building the target.
Debian 8 stable ships with gcc 4.9.2 and cmake 3.0.2. Previously
the depends package used CMAKE_CXX_STANDARD to tell cmake to use
C++11, but the option requires cmakes 3.1+. To resolve the issue
we now update relevant CMakeLists.txt and set CMAKE_CXX_FLAGS.
ca333
Simon