Changed State class to take Fluid name as str instead of bytes

- eliminate bytes/string conversion problems under Python 3
- consistent interface for Props and State classes
Resolve Python 3 problem with StateDict.items() (Fixed #81)

- items() method for dict returns list on Py2, but dict_item on Py3
Unified approach to parameter handling
added `numpy` compatibility
more debug output
Just one small change
Merge branch 'refs/heads/fix_66'
Merge pull request #86 from spinnau/fix_81

Fixed CoolProp.State.State class for Python 3
Tidying up of BibTex (typo for Melinder first name)

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Added scripts to build and run all of the examples on my computer.  A more generalized solution would be great.

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge branch 'master' of https://github.com/ibell/coolprop

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Updated the files for the examples

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Fixed bug with TTSE range checking

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Prep for 4.0.  Everything that uses VS now uses multiple processors to compile for speed

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Fixed bug with Humid air - new DerivTerms needs to be rethought/fixed to be able to handle temperatures below triple point

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Mixture phase envelope construction uses spline interpolation once 4 points are in existence

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Lemmon Reducing parameters derive from GERG formulation, constants are converted based on derivation in docs and header file

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
saturation_p takes beta directly; fixed bug in NR VLE for non-zero beta

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
JSON double arrays can also accept integers

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Can now accept the vectors of components for departure functions that are used for multiple fluids

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>