Removed nonessential variables from Species
Updated documentation for Connectors
Updated Species model for normal force as flow
Changed C -> C- and C19HF37O5S -> C19HF37O5S+
Made densities of e- and H+ constant
Updated BCs
Moved tests to new Test package
Corrected specific entropy function
Removed Sensors (will add measurement functionality to BCs)
Renamed BCs->Conditions
Updated release script