changes tags to a list of dicts in the db, adding tag slugs

- adds a function to convert the tag list of dicts to a text string
  properly delimited for loading into forms
- tag string conversion function updated to generate list of dicts
- updates all mentions of the conversion of the string to the tags db
  object
- adds a tags template utility and updates the media template accordingly

mediagoblin/submit/views.py

@@ -22,7 +22,7 @@ from werkzeug.utils import secure_filename
 
 from mediagoblin.util import (
     render_to_response, redirect, cleaned_markdown_conversion, \
-    convert_to_tag_list)
+    convert_to_tag_list_of_dicts)
 from mediagoblin.decorators import require_active_login
 from mediagoblin.submit import forms as submit_forms, security
 from mediagoblin.process_media import process_media_initial
@@ -62,7 +62,8 @@ def submit_start(request):
             entry['uploader'] = request.user['_id']
 
             # Process the user's folksonomy "tags"
-            entry['tags'] = convert_to_tag_list(request.POST.get('tags'))
+            entry['tags'] = convert_to_tag_list_of_dicts(
+                                request.POST.get('tags'))
 
             # Save, just so we can get the entry id for the sake of using
             # it to generate the file path