Fleetmojis v2.0

A set of custom emojis for the Fleetio team to use in our Slack channel. This is version 2.0, a refinement of the first version that also adds 25 more emojis.

Compared to v 1.0, the tires were shortened a bit while the surface area of the "face" was increased to allow for larger expressions. Colors were also tweaked just a bit to provide better contrast at smaller sizes.