Added a Formula to install the EC2 API tools.

Unfortunately, dealing with them requires quite a bit of shell configuration.
I offered the best documentation of this configuration that I could, but it’s
fairly verbose and a bit repulsive… unfortunately, the other option (attempting
to preform the setup automatically) turns out to be even messier, and prone to
mistakes to boot.

Formula/ec2-api-tools.rb

@@ -0,0 +1,47 @@
+require 'brewkit'
+
+class Ec2ApiTools <Formula
+  @homepage='http://developer.amazonwebservices.com/connect/entry.jspa?externalID=351'
+  @url='http://ec2-downloads.s3.amazonaws.com/ec2-api-tools-1.3-41620.zip'
+  @md5='14734acff6ac8f6899de0398d3eeb0f6'
+  @version='1.3-41620'
+  
+  def install
+    # Nothing to be done but copying things into place
+    FileUtils.rm Dir['bin/*\.cmd']
+    
+    (prefix+bin).install Dir['bin/ec2-*']
+    prefix.install 'lib'
+  end
+  
+  def caveats
+    puts <<-EOS
+==============================================================================
+Before you can utilize the EC2 API tools, you must export several environment
+variables to your $SHELL. The easiest way to do this is to add them to your
+dotfiles. If you’re running the `bash` shell (the default), you’ll want to add
+them to `~/.bash_profile`. If this is the case, run `nano ~/.bash_profile` at
+a terminal to edit said file. zsh users will want to edit `~/.zprofile`
+instead.
+
+    export JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Home/"
+    export EC2_HOME="#{prefix.to_s}/"
+
+However, you’re still not ready to use the tools. You need to download your
+X.509 certificate and private key from Amazon Web Services. These files are
+available at the following URL:
+
+http://aws-portal.amazon.com/gp/aws/developer/account/index.html?action=access-key
+
+You should download two `.pem` files, one starting with `pk-`, and one
+starting with `cert-`. You need to put both into a folder in your home
+directory, `~/.ec2`, and then add the following to your profile file:
+
+    export EC2_PRIVATE_KEY="$(/bin/ls $HOME/.ec2/pk-*.pem)"
+    export EC2_CERT="$(/bin/ls $HOME/.ec2/cert-*.pem)"
+
+==============================================================================
+    EOS
+  end
+  
+end