Update icon font

Updated to include some Streamline icon glyphs, added play and pause circled icons.
Adjust Share icon size/position

Adjusted to account for difference in size of glyph between old icon and new Streamline glyph
Re-mapped Unicode character codes

Addresses @kabel's comment: https://github.com/unl/wdntemplates/pull/809#issuecomment-57683527
Merge pull request #809 from skoolbus39/wdn-icons

Update wdn-icons