Update pin styles - ideas for further improvements

[robyngit]

Changes:

• Prevent clipping at the edges of the pin image
• Pin image resolution is higher
• All the non-dynamic changes to the Font Awesome SVG happen only once, outside of the styleBillboard method
• Outline width is constant, scales better with changing markerSize
• Add attributes to SVG element not the PATH element
• Remove fill-rule (not needed)

Before:

After:

[robyngit]

Left To Do (reminder for me):

• [x] Add tests for new Icon Utilities methods