`nth-of-type` fix for block-grids

`nth-of-type` should be applied to the `li` to have the contents float correctly.
Make TopBar respond to $text-direction 

TopBar doesn't respond to `$text-direction: rtl` correctly. So I used `$default-float` and `$default-opposite` and it seems to be working.
Update pricing-tables.html.erb

Wrong mixin
setting img to inline-block as setting it to block for all images breaks most website layouts
setting img to inline-block as setting it to block for all images breaks most website layouts
setting img to inline-block as setting it to block for all images breaks most website layouts
setting img to inline-block as setting it to block for all images breaks most website layouts
Fix horizontal nav positioning.
Bump section.js version to 4.0.5
Fix border issue in section horizontal.
use progress bar vars instead of global color vars
Temporary fix for Zepto outerheight issues in section.js
add bg color variable for progress bar
added 4.0.5 upcoming to docs
removed old zurb jobs partial, exists in sidebar now
updated visibility classes
Merge pull request #1716 from eillarra/patch-2

`nth-of-type` fix for block-grids
fixed block grid nth-of-type clear fix
added mixin clearing instruction to block grid docs
Merge pull request #1740 from martianboy/patch-1

Make TopBar respond to $text-direction