Replace static inline-list margin value

Margin on inline-list always set to rem-calc(22), replaced with $inline-list-default-float-list-margin
Merge branch 'patch-5' of github.com:serglo/foundation into serglo-patch-5
Add $inline-list-default-float-list-margin to _settings.scss and docs
Merge branch 'master' of github.com:zurb/foundation