Fix double comma in selector

In make-grid-columns() and make-grid-columns-float() mixins there was a double comma in the list of selectors ($list). This was find for Ruby sass compiler, but libsass didn't accept it.

Fixes issue #117.
js comments and README updated to v3.0.1
Merge pull request #121 from AJ-Acevedo/master

js comments and README updated to v3.0.1
update js files to match 3.0.2
update docs to match 3.0.2
update orga files to match 3.0.2
update font files to match 3.0.2
update read me to match 3.0.2
update .dotfiles to match 3.0.2
update sass files to match 3.0.2
update sass files to match 3.0.2

minor fixes
build bootstrap v3.0.2 with sass version 3.2.12
Merge pull request #123 from m5o/3.0.2

update to match bootstrap v3.0.2
Merge pull request #119 from dchest/patch-1

Fix double comma in selector