v5.3.0

Added 37 new icons:

• add-page-alt
• angle-tool
• avi-format
• bread-slice
• closed-captions
• clutery
• coffee-cup
• design-nib
• forward-message
• forward
• gif-format
• hammer
• jpeg-format
• jpg-format
• list-select
• mail-in
• mail-out
• mpeg-format
• npm-square
• npm
• png-format
• raw-format
• remove-page-alt
• reply-to-message
• reply
• screenshot
• send-diagonal
• send-mail
• send
• submit-document
• svg-format
• text-box
• tif-format
• tiff-format
• tools
• webp-format
• wrench