Small code cleanups

[asinghvi17]

• The ColorScheme struct documentation was getting overwritten by the function, so I just dropped that.
• Slightly more informative error message when rangescale is unrecognized

[asinghvi17]

Very interesting. I'll revert that and look for why.

[asinghvi17]

Let's see if this works - I think it might have been a macro issue.

[asinghvi17]

I think this is one for the "cool hack" club:

julia> import Base.:/

julia> a::String/b::String = joinpath(a, b)
/ (generic function with 116 methods)

julia> 1/2
0.5

julia> @__DIR__/"a"
ERROR: syntax: "/" is not a unary operator
Stacktrace:
    Function         Module  Signature
    ────────         ──────  ─────────
[1] top-level scope
REPL[5]:0

julia> (@__DIR__) / "a"
"mydir/a"

[cormullion]

perhaps joinpath is better here?

[asinghvi17]

Yes, I've reworked that to use joinpath, and tests seem to pass. That example was just a hack which I remembered was possible.

[asinghvi17]

The documentation build is failing because of a compat constraint. I'll add CompatHelper and adjust that.

[cormullion]

good stuff!