bypass options to the binary optimizer (optijpeg, optipng) by using the 'command_options' argument
filenames with spaces, parentheses, brackets, and others cause exception
support to piet-binary gem
adding a section in README explaining how to install the binaries easily with piet-binary gem
bump version
Merge pull request #13 from loureirorg/master

Bug in filenames with parentheses / Options bypass to command line