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add imagemagick dependency to contributing guide

Several tests in driver_rendering_spec.rb require the identify command
that is part of Imagemagick. Without it they fail with output similar to
the following.

     MiniMagick::Error:
       Command ("identify -ping
/var/folders/y3/vfvjgwm91f1fmt2syh21czx40000gn/T/mini_magick20120115-49056-pwh5nl-0.png")
failed: {:output=>"sh: identify: command not found\n",
:status_code=>127}
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1 parent 59ba861 commit df392683957e32f5d9257e2c4a5312a06830dd36 @marcisme marcisme committed with halogenandtoast Jan 15, 2012
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  1. +9 −0 CONTRIBUTING.md
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@@ -1,5 +1,14 @@
We love pull requests. Here's a quick guide:
+Dependencies
+
+Some of the tests depend on the `identify` command that comes with Imagemagick.
+Imagemagick can be installed via [homebrew](http://mxcl.github.com/homebrew/).
+
+ brew install imagemagick
+
+Contributing
+
1. Fork the repo.
2. Run the tests. We only take pull requests with passing tests, and it's great

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