Install cmake on Build VMs

Explains how to provision and configure virtual machine instances specifically for Buildbot testing.

Requires cmake. Install cmake on all -build VMs (and other Unix-like machines) with:

wget http://www.cmake.org/files/v2.8/cmake-2.8.8.tar.gz
tar -zxvf cmake-2.8.8.tar.gz
cd cmake-2.8.8;./configure
make
sudo make install

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