v1.2.1

Bumped version

v1.2.0: Merge pull request #8 from Jakobud/develop

• Replaced the deprecated division math symbol (/) with math.div
• Added ability to specify multiple property values similar to how vanilla CSS is written

// Before
@include poly-fluid-sizing('padding-top', (768px: 30px, 1024px: 40px));
@include poly-fluid-sizing('padding-right', (768px: 20px, 1024px: 30px));
@include poly-fluid-sizing('padding-bottom', (768px: 20px, 1024px: 40px));
@include poly-fluid-sizing('padding-left', (768px: 10px, 1024px: 30px));

// Now
@include poly-fluid-sizing('padding', (768px: 30px 20px 20px 10px, 1024px: 40px 30px 40px 30px));