Adds usage information for each icon set.

[bslatkin]

This was really frustrating for me because the explanation of usage is in the last sentence of the first section of this page and basically nowhere else. This change puts the usage information right on the sheet of example icons so it's easier for newbies to figure it out.

[agranoff]

Please pull this in, it's almost impossible to figure out otherwise!

[bslatkin]

Hey @azakus @robdodson @addyosmani can one of you merge this? We just hit this problem again today. Thanks in advance.

[googlebot]

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[bslatkin]

@googlebot I'm a Google employee

[dfreedm]

@bslatkin googlebot is a dumb bot that only checks email addresses and github usernames. Your personal commit email address confused it :)

[cdata]

:+1: This has tripped me up a number of times as well.