Bump jasmine gem
Add inline class helpers

Sometimes you need a class that simply changes the display of the
semantic element you’re using. eg a form consisting of just a button
needs to be inline with nearby text.
Fix lead styles when text-muted is used

The text-muted styles don’t have enough specificity to override the
#555 colour.

Spotted on transition home page.
Merge pull request #48 from alphagov/bump-jasmine-gem

Tweak CSS helpers