New framework discovery mechanism: Compass can now load any number of

frameworks by passing a directory that contains those frameworks. Each
framework can choose to adhere to the naming convention of providing a
'stylesheets' directory and a 'templates' directory, or it can register
itself by providing a ruby file at one of the following locations:

<plugin>/compass_init.rb
<plugin>/lib/<plugin>.rb
<plugin>/<plugin>.rb

The first file found in the above order will be required. The framework
should register itself there using the Compass::Frameworks.register method.

frameworks/blueprint.rb

@@ -1,2 +0,0 @@
-blueprint_dir = File.join(Compass.base_directory, 'frameworks', 'blueprint')
-Compass::Frameworks.register('blueprint', blueprint_dir)

frameworks/compass.rb

@@ -1,2 +0,0 @@
-compass_dir = File.join(Compass.base_directory, 'frameworks', 'compass')
-Compass::Frameworks.register('compass', compass_dir)

lib/compass/frameworks.rb

@@ -1,6 +1,10 @@
 module Compass
   module Frameworks
+    extend self
+
     ALL = []
+    DEFAULT_FRAMEWORKS_PATH = File.join(Compass.base_directory, 'frameworks')
+
     class Framework
       attr_accessor :name
       attr_accessor :templates_directory, :stylesheets_directory
@@ -12,18 +16,38 @@ module Compass
         @stylesheets_directory = options[:stylesheets_directory] || File.join(path, 'stylesheets')
       end
     end
+
     def register(name, *arguments)
       ALL << Framework.new(name, *arguments)
     end
+
     def [](name)
       ALL.detect{|f| f.name.to_s == name.to_s}
     end
-    module_function :register, :[]
+
+    def discover(frameworks_directory)
+      frameworks_directory = DEFAULT_FRAMEWORKS_PATH if frameworks_directory == :defaults
+      frameworks_directory = Dir.new(frameworks_directory) unless frameworks_directory.is_a?(Dir)
+      frameworks_directory.entries.reject{|e| e[0] == ?.}.each do |framework|
+        register_directory File.join(frameworks_directory.path, framework)
+      end
+    end
+
+    def register_directory(directory)
+      loaders = [
+        File.join(directory, "compass_init.rb"),
+        File.join(directory, 'lib', File.basename(directory)+".rb"),
+        File.join(directory, File.basename(directory)+".rb")
+      ]
+      loader = loaders.detect{|l| File.exists?(l)}
+      if loader
+        require loader
+      else
+        register File.basename(directory), directory
+      end
+    end
+
   end
 end
 
-# Import all of the default frameworks.
-default_frameworks_directory = File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'frameworks'))
-Dir.glob(File.join(default_frameworks_directory, "*.rb")).each do |framework|
-  require framework
-end
+Compass::Frameworks.discover(:defaults)