Updates for GasModels v0.7

[tasseff]

No description provided.

[codecov]

Codecov Report

Merging #43 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   98.38%   98.39%           
=======================================
  Files          15       15           
  Lines         248      249    +1     
=======================================
+ Hits          244      245    +1     
  Misses          4        4           

Impacted Files	Coverage Δ
src/GasPowerModels.jl	100.00% <ø> (ø)
src/core/constraint_template.jl	100.00% <ø> (ø)
src/core/objective.jl	100.00% <ø> (ø)
src/core/variable.jl	100.00% <ø> (ø)
src/prob/ne.jl	100.00% <ø> (ø)
src/core/base.jl	100.00% <100.00%> (ø)
src/core/ref.jl	100.00% <100.00%> (ø)
src/prob/ne_opf.jl	100.00% <100.00%> (ø)
src/prob/opf.jl	100.00% <100.00%> (ø)

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[tasseff]

Hold off on merging until I correct the ogpf to opf naming convention!