v5.5

Added 27 new icons:

• at-sign-circle
• at-sign
• brain-electricity
• brain-research
• brain-warning
• brain
• candlestick-chart
• card-issue
• card-locked
• card-security
• cooling
• credit-cards
• diameter
• dna
• graduation-cap
• heating
• inclination
• mastercard-card
• microscope
• paypal
• radiation
• radius
• rubik-cube
• vials
• x-coordinate
• y-coordinate
• z-coordinate