Recursively resolve map values

[RedHatter]

Closes #118

Recursively resolves map values so you can access maps within your maps. Consider the following example.

colors.yal

red: '#b71c1c'

palette.yal

main: map(colors, red)

input

a {
  color: map(palette, main);
}

output

a {
    color: #b71c1c;
}

This would also work for referencing values within the same map.

palette.yml

main: '#b71c1c'
text-color: map(palette, main)

[coveralls]

Coverage decreased (-3.3%) to 96.667% when pulling 36e42b4 on RedHatter:recusive-map into efcdc96 on pascalduez:master.

[coveralls]

Coverage decreased (-3.3%) to 96.667% when pulling 36e42b4 on RedHatter:recusive-map into efcdc96 on pascalduez:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 555c7cf on RedHatter:recusive-map into efcdc96 on pascalduez:master.

[pascalduez]

Lookin' good! Thanks.

[pascalduez]

[email protected]

[pascalduez]

Should be documented though, now that's a "true" and tested feature.