For example:
nest(".foo", "a, em, b")
would render:
.foo a, .foo em, .foo b
The nest function can take any number of arguments and each argument can have any number of comma-delimited selectors.
To perform a reset, simply @import compass/reset.sass
To perform a selective reset, you should @import compass/utilities/general/reset.sass which will provide
reset mixins without defining any css rules.