SDD: Update element names

AirSys:ClgSupAirTemp -> ClgDsgnSupAirTemp
AirSys:HtgSupAirTemp -> HtgDsgnSupAirTemp
SDD: Update translation for SZVAV and SZVAVHP

Adjust parameters according to Google Code ticket:
https://code.google.com/p/cbecc/issues/detail?id=327
SDD: Remove assumptions about SizingSystem

Now the SizingSystem parameters simply come from ClgDsgnSupAirTemp and
ClgDsgnSupAirTemp.  Previously there was some trickyness based on the
control strategy.  Now we expect the SDD to provide the right thing.
Merge branch 'develop' of https://github.com/NREL/OpenStudio into develop