Added a method to calculate the bubble point by EOS.  Split up the method that calculates the constants of the EOS into a part that is temperature dependent (only) and the part that is temperature and pressure dependent.  This eliminates some wasteful recalculations.
Some git error message told me to do this.
Merge branch 'master' of https://github.com/selenized/scipy-thermo-eos

Conflicts:
	.spyderworkspace