Added help texts to command line options
imgmin needs at least 2 steps, in order to produce something usable
Merge pull request #22 from Tenzer/help-texts

Added help texts to command line options
Merge pull request #23 from Tenzer/min-steps

Impose a minimum limit to amount of steps of 2
streaming video dominates static traffic these days
Update and rename README.txt to README.md
Merge pull request #27 from Zearin/patch-1

Update and rename README.txt to README.md
use https:// git url
added imgmin logo by pornel :)
fix trivial typos
oops, didn't give pornel authorship. removing images and re-adding...
added imgmin logo by pornel :)