fixed array loading.
	modified:   sink.py
Cleanup debugging print statements.
	modified:   sink.py
workaround for out of memory issue on stampede.
	modified:   sim.py
Merge branch 'master' into dev
New methods for plotting radius-temperature plot.
	modified:   snapshot.py
	modified:   scripts/gas_phase.py
Implemented __getstate__ methods to allow for object serialization/pickling.
	modified:   hdf5.py
	modified:   snapshot.py
	modified:   sph.py
Drastically reduced multitasking memory overhead!
	modified:   sim.py
Removed r900 hack -- not needed anymore.
	modified:   sim.py