Plugins doc + minor design changes.

pelican/plugins/global_license.py

@@ -1,4 +1,4 @@
-from blinker import signal
+from pelican import signals
 
 """
 License plugin for Pelican
@@ -19,5 +19,5 @@ def add_license(generator, metadata):
         and 'LICENSE' in generator.settings.keys():
             metadata['license'] = generator.settings['LICENSE']
 
-
-signal('pelican_article_generate_context').connect(add_license)
+def register():
+    signals.article_generate_context.connect(add_license)

pelican/plugins/gravatar.py

@@ -1,6 +1,6 @@
 import hashlib
 
-from blinker import signal
+from pelican import signals
 """
 Gravata plugin for Pelican
 ==========================
@@ -37,4 +37,4 @@ def add_gravatar(generator, metadata):
     
 
 def register():    
-    signal('pelican_article_generate_context').connect(add_gravatar)
+    signals.article_generate_context.connect(add_gravatar)

pelican/plugins/initialized.py

@@ -1,8 +1,7 @@
-from blinker import signal
-
+from pelican import signals
 
 def test(sender):
     print "%s initialized !!" % sender
 
 def register():
-    signal('pelican_initialized').connect(test)
+    signals.initialized.connect(test)