Adding gruvbox dark theme - light one to follow! :)

styl/gruvbox-colors.styl

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+// * gruvbox-colors.styl
+
+// ** A theme based of the gruvbox color scheme
+
+base03 = #3c3836
+base02 = #282828
+base01 = #b8bb26
+base00 = #fabd2f
+base0 = #83a598
+base1 = #8ec07c
+base2 = #a89984
+base3 = #ebdbb2
+yellow = #d79921
+orange = #fb4934
+red = #cc241d
+magenta = #b16286
+violet = #d3869b
+blue = #458588
+cyan = #689d6a
+green = #98971a

themes/gruvbox-dark.styl

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+// * gruvbox-dark.styl
+
+@require gruvbox-colors
+
+// ** Colors
+color-a = blue
+color-a-visited = violet
+
+color-background = base02
+color-background-highlight = base03
+color-background-highlight-extra = base01
+color-background-highlight-extra-less = lighten(color-background-highlight, 4%)
+color-background-highlight-extra-less-less = lighten(color-background-highlight, 2%)
+color-background-highlight-tad-extra = lighten(color-background, 2%)
+
+
+color-border = base00
+color-text = base0
+comment = base01
+
+emphasized = base1
+emphasized-more = base2
+emphasized-more-more = base3
+
+button-gradient-top = color-background-highlight-extra
+button-gradient-bottom = color-background-highlight