PR: optimize split_file_uri

[ahorek]

this gsub is more complicated than it needs to be

related #503

[rails-bot]

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[ahorek]

I need to skip some tests, but file:///C:/ isn't valid on linux, right?

[ahorek]

windows ruby 2.4.2: 3x - 10x
linux ruby 2.4.2: 9x - 28x
windows jruby 9.1.13.0: 1.5x - 2x
linux jruby 9.1.13.0: 12x - 20x