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libusb binding for Ruby

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I've moved the C files under ext/usb. I added a Rakefile so that you can do: ``` $ rake compile ``` Or for installation directly from git: ``` $ rake...

Hi Tanaka Following from my email - this is the changes to make it easy to release gems with jeweler

This patch adds a link in README to the newer libusb-gem running with libusb-1.0.

The code: ``` USB.devices.each do |dev| puts dev pp dev puts "" end ``` produces the following error: ``` # /Users/cjh/.rvm/gems/ruby-1.9.2-p180/gems/ruby-usb-0.2.1/lib/usb.rb:412:in `usb_get_string_simple': Input/output error - usb_get_string_simple (Errno::EIO) from /Users/cjh/.rvm/gems/ruby-1.9.2-p180/gems/ruby-usb-0.2.1/lib/usb.rb:412:in `get_string_simple'...