Standardize error message grammar, add test for bad composite parameters, fix a few other grammar things

[jmwingenroth]

Hello!

My name is Jordan, and I'm new on this project. I met with @davidanthoff on Monday and he set me loose on the issue stack.

Edit: Here, I fixed a few grammatical issues, then set up a test to improve code coverage. I intended this mostly as an introduction and a hands-on way to begin to familiarize myself with Mimi's code.

[codecov]

Codecov Report

Merging #792 (5382421) into master (24e61f5) will increase coverage by 0.05%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #792      +/-   ##
==========================================
+ Coverage   78.77%   78.83%   +0.05%     
==========================================
  Files          35       35              
  Lines        3062     3061       -1     
==========================================
+ Hits         2412     2413       +1     
+ Misses        650      648       -2     

Flag	Coverage Δ
unittests	78.83% <80.00%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/core/connections.jl	85.40% <0.00%> (ø)
src/core/defcomposite.jl	89.52% <0.00%> (ø)
src/core/build.jl	100.00% <100.00%> (ø)
src/core/defcomp.jl	82.24% <100.00%> (ø)
src/core/defs.jl	82.96% <100.00%> (+0.27%)	⬆️
src/core/references.jl	65.38% <100.00%> (ø)
src/utils/getdataframe.jl	75.29% <100.00%> (ø)
src/core/delegate.jl	91.66% <0.00%> (+3.66%)	⬆️

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[lrennels]

Great! Welcome @wingfactor I can take a look at this on Monday, happy to see you digging your hands in!

[lrennels]

@wingfactor would you like me to merge this or would you rather keep it open for a while as your learning branch?

[jmwingenroth]

@lrennels You can go ahead and merge it, thank you for checking. I've got a fork of the project to keep experimenting with and to submit future pull requests from.