theano-fied mixture.py
replace calls to einsum in eos.py
fix mixture.py
make SpHeatModels a bit better
move enthalpy and specific heat to EOS
begin porting EOS to Theano
add some TODOs
extend EOS
add more expressions for EOS
begin porting for speicif cheat models to theano
fix a test
make a single test pass on GPU (mixture.py)
port EOS and mixture to GPU and modify tests
use expressions module in eos
use expressions module in emixture
comment out an outdated test
failing commit, fix required
fix bug in specific heat model
update a TODO