Titan2 d demo

1. Fixed io: particle types are correctly identified before being written to a shared buffer
2. Added print of particle type after reading a snapshot/when renderer gets new data/when bonsai_io gets new data for tracking
3. Checked compilations with gcc 4.8.2 and gcc 4.9.1 and fixed warnings where possible, otherwise added compile flag to ignore them
4. Code clean-up. Remove some files that do not belong here.