updating css parser to fix bugs

@rev goliver@ async
@bug W-1935059@
@bug W-1935163@
@bug W-1935763@
Merge branch 'css-bug-fixes' of git.soma.salesforce.com:nmcwilliams/aura into bob/master-pending/pr37-update-omakase
Merging origin/bob/master-pending/pr37-update-omakase into master