Change how JS libs are loaded

This change makes Django-Debug-Toolbar use the existing version of jQuery
on the page if one exists, and only loads jQuery if it isn't already loaded.
It also explicitly loads the jQuery cookie plugin and the toolbar script
as separate files. Finally, we are no longer compressing/minimizing scripts;
this is for debug purposes, and presumably will not be served in production.

Author: singingwolfboy

Makefile

@@ -22,10 +22,6 @@ coverage:
 		coverage run --branch --source=debug_toolbar `which django-admin.py` test tests
 	coverage html
 
-compress_js:
-	yuicompressor debug_toolbar/static/debug_toolbar/js/jquery.js > debug_toolbar/static/debug_toolbar/js/toolbar.min.js
-	yuicompressor debug_toolbar/static/debug_toolbar/js/toolbar.js >> debug_toolbar/static/debug_toolbar/js/toolbar.min.js
-
 compress_css:
 	yuicompressor --type css debug_toolbar/static/debug_toolbar/css/toolbar.css > debug_toolbar/static/debug_toolbar/css/toolbar.min.css
 

debug_toolbar/static/debug_toolbar/js/toolbar.min.js

@@ -3,7 +3,9 @@
 @media print { #djDebug {display:none;}}
 </style>
 <link rel="stylesheet" href="{{ STATIC_URL }}debug_toolbar/css/toolbar.min.css" type="text/css" />
-<script type="text/javascript" src="{{ STATIC_URL }}debug_toolbar/js/toolbar.min.js"></script>
+<script>window.jQuery || document.write('<script src="{{ STATIC_URL }}debug_toolbar/js/jquery.js"><\/script>')</script>
+<script src="{{ STATIC_URL }}debug_toolbar/js/jquery.cookie.js"></script>
+<script src="{{ STATIC_URL }}debug_toolbar/js/toolbar.js"></script>
 <div id="djDebug" style="display:none;" dir="ltr" {{ TOOLBAR_ROOT_TAG_ATTRS|safe }}>
 	<div style="display:none;" id="djDebugToolbar">
 		<ul id="djDebugPanelList">