v0.11.7

Thermodynamics v0.11.7

Diff since v0.11.6

Merged pull requests:

• Use ifelse in liquid_fraction, plus a comment about condensate probability (#178) (@glwagner)
• Remove unused argument in virtual_temperature (#191) (@charleskawczynski)

Closed issues:

• Why is density an input to virtual_temperature? (#190)