Add icon-star-half-full

The star is half full, @davegandy. The star is half full.

Signed-off-by: David Celis <me@davidcel.is>
updating readme
updating readme
and again
more updating of readme
more updates to readme
more updates to readme, prepping for changes to tw
more updates to readme
more updates to readme
and another update to readme
updating with 3.1.1 milestone progress
updating milestones to closed in readme
fixing #1032
fixing #1024
Merge pull request #1030 from davidcelis/master

Add alias for icon-star-half-full
fixing up icon-star-half-full alias
updating handle