don't require yaml until we need to write settings

we don't require yaml when we need to read the settings by using our own ghetto 
YAML parser that only applies to Bundler config files. specs still pass. :P

lib/bundler.rb

@@ -2,7 +2,6 @@
 require 'fileutils'
 require 'pathname'
 require 'bundler/gem_path_manipulation'
-require 'bundler/psyched_yaml'
 require 'bundler/rubygems_ext'
 require 'bundler/rubygems_integration'
 require 'bundler/version'

lib/bundler/settings.rb

@@ -111,6 +111,7 @@ def set_key(key, value, hash, file)
         hash[key] = value
         hash.delete(key) if value.nil?
         FileUtils.mkdir_p(file.dirname)
+        require 'bundler/psyched_yaml'
         File.open(file, "w") { |f| f.puts hash.to_yaml }
       end
       value
@@ -127,9 +128,10 @@ def local_config_file
 
     def load_config(config_file)
       if config_file.exist? && !config_file.size.zero?
-        yaml = YAML.load_file(config_file)
+        Hash[config_file.read.scan(/^(BUNDLE_.+): '?(.+?)'?$/)]
+      else
+        {}
       end
-      yaml || {}
     end
 
   end