Merge pull request #2 from treecode/Titan2D-demo

Titan2 d demo
added client skeleton for catalyst
added call to callback function
removed -mavx from OSX
add linking with clang++ in case of OSX
CMake project for catalyst using Clang on Mac OSX
Merge branch 'biddisco-Titan2D-demo' into Titan2D-demo
Merge pull request #13 from egaburov/Titan2D-demo

Added catalyst/ParaView sekelton code