Same height for pure-button when using custom fonts

When using custom fonts, buttons (a and input) don't have the same
height (issue #221).
Revert "Same height for pure-button when using custom fonts"

This reverts commit 2ed11acb47fea0a016761278e93b0c4343473227.
pure buttons with custom fonts
Merge branch 'master' of github.com:narcis-radu/pure into narcis-radu-master
Add HISTORY entry for normalized button heights