Fixes #873 json BIF returns literals for colours
formatting
added gedit 3.0 solution.

For gtksourceview 3.0 (gedit 3.0), user: 
    mkdir -p ~/.local/share/gtksourceview-3.0/language-specs/ && wget https://raw.github.com/LearnBoost/stylus/master/editors/gedit/styl.lang -O ~/.local/share/gtksourceview-3.0/language-specs/styl.lang
Fixes #1096. Check found before fs.stat
Corrects include of the css files when --resolve-url is on
Fixes #1100. Negating a variable causes assignment
small optimization
Improvement of the json bif
Global vars by default
Fixes #1103. Tests under windows
Added --print option to print CSS to stdout.

Signed-off-by: Jason Lewis <jason.lewis1991@gmail.com>
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Merge branch 'pr/1099' into rc-0.37
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Merge branch 'pr/1101' into rc-0.37
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Merge branch 'pr/1102' into rc-0.37
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Merge branch 'pr/1105' into rc-0.37
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