Revised EOS

[huynmela]

Revised EOS script to include VdW EOS along with modified VdW properties csv. Changed gas to fluid and modified docs to include VdW.

[coveralls]

Pull Request Test Coverage Report for Build 432

• 36 of 46 (78.26%) changed or added relevant lines in 2 files are covered.
• 44 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+0.03%) to 79.958%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/EOS.jl	34	44	77.27%
<!--	Total:	36	46	78.26%	-->

Files with Coverage Reduction	New Missed Lines	%
src/EOS.jl	1	73.33%
src/Crystal.jl	3	66.9%
src/Grid.jl	4	77.73%
src/Henry.jl	5	82.2%
src/GCMC.jl	31	62.02%
<!--	Total:	44		-->

Totals
Change from base Build 407:	0.03%
Covered Lines:	1137
Relevant Lines:	1422

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💛 - Coveralls

[ahyork]

This had errors when running with julia 0.7 on travis build 426 that were not present in julia 1.0. I dropped support for julia 0.7 with this branch and added testing for julia 1.1

[SimonEnsemble]

@huynmela looks great. Before merging, please:

• remove "***NOTE: Do not delete the last three comment lines..." from the doc strings.
• Please allow CSV to read in the .csv files and skip the lines marked as a comment #. See here for how to do so.
• Please put the source of where you got the PengRobinson and VdW params inside the .csv files. It is better here as opposed to the documentation because we should let the user amend these with their own comments and with params from different sources (negating the docs).
• ask @ahyork for help with this: to ensure that CSV is up to date to allow reading in comments; I believe this is a recent development.

[SimonEnsemble]

when you put CSV 0.5.9 in the REQUIRE file, does that mean CSV.jl has to be 0.5.9 version, or >0.5.9 is okay?

[ahyork]

Having CSV 0.5.9 sets a floor for CSV at version 0.5.9, so anything >0.5.9 will also work