Unitless line-height and Fontsizes in rem

[7samurai]

Hi, first at all: awesome work.

Now some questions: What about some tweaks, maybe whit the chance to change it as an user.
#1 Unitless line-height -> If the font changes, its better to habe these unitless, formular: line-height/font-size:
line-height: 32px;
font-size: 27px;
results in
line-height: 1.185185185;

#2 Let the User define an basis font size (for Example 16px), an give back units in em or better (in my opinion) rem
formular: font-size / base-size -> 27px / 16px = 1.6875rem

[aprinciple]

+1, add support for line-hieght