Merge branch 'release/v0.8.6' into develop
Add GUACAMOLE_ENABLE_PHYSICS option.
Optionally compile physics.
Include TriMeshLoader.hpp.
Build schism in externals.
Add ppa for cmake.
Set boost include and lib directories.
Install opencl-headers.
Build guacamole.
Install cuda.
Install freeimage.
Add flags to cmake.
Add command line flags to cmake.
Install libboost1.48-all-dev.
Install libbullet.
Remove libbullet-extras-dev.
Add --force-yes.
Set boost include and lib directories.
Add libzmq-dev
Use zmq3 instead.