Rebranding!

Replaced “mixlr-toolkit” with “jefflr”;
Fixed extension

Added jquery (extensions don’t use on-page jquery, apparently);
Fixed nav issue;
Clean up node modules.
First draft as coffee.
Unbreak my hearting.
Merge branch 'mixirc-ng'
Merge branch 'mixirc-gnu' of https://github.com/Hajitorus/jefflr into Hajitorus-mixirc-gnu
Merge branch 'Hajitorus-mixirc-gnu' into mixirc-ng