Added Melange front page edit view where you can change title, content, feed url. Created SiteSettings and Document models and some logic for them. Added isFeedURLValid function in soc/logic/feed.py. Created some functions for handling datastore updates of different kinds of Models (soc/logic/model.py). Fixed some typos and too long lines of code. Patch by: Pawel Solyga Review by: to-be-reviewed

Added feedparser to soc/utils and modified svn:externals for vendor to include feedparser svn Patch by: Pawel Solyga Review by: to-be-reviewed

Add getAltResponseIfNotLoggedIn() and getAltResponseIfNotDeveloper() simple view helpers. These cannot go into response_helpers.py because they create a circular reference with simple.py, and Django view import fails. Review URL: http://codereviews.googleopensourceprograms.com/602

Improve the __doc__ string of isIdDeveloper() to explain better how it now functions.

Make isIdDeveloper() also able to check an is_developer Boolean property in User entities. Review URL: http://codereviews.googleopensourceprograms.com/601

Replace checkLinkNameForId() with isLinkNameAvailableForId(), and implement that new function in terms of only the existing doesLinkNameExist() and doesLinkNameBelongToId(). Patch by: Todd Larsen Review by: Pawel Solyga Review via: discussion of patches on melange-soc-dev mailing list

Fixed one typo in response_helpers which caused is_admin context variable not to work correctly. Created new checkLinkNameForId function that checks if link_name is correct when creating new user and modifying existing one. This is now used for validation instead of doesLinkNameBelongToId in UserForm clean_link_name function. The previous validation function didn't allow to create new users and modify linkname of existing ones. Additionally I created new doesLinkNameExist helper function.