Added default flag to Media Query Ranges

Because currently you can't change the breakpoints from _settings.scss
Fixed hardcoded direction in top bar css
Merge pull request #3742 from kostaspt/patch-1

Added default flag to Media Query Ranges
Fixed some more hardcoded directions. Removed direction setting on type to improve BIDI support
Returned default direction to ltr
Fixed dont styles typos
Added device width to docs
reset default direction to ltr
remove redunant _functions.scss partial
Merge branch 'master' of github.com:zurb/foundation