Upgrade Django - Post 1.6 / Pre 1.7 Steps

[adriancollier]

Third task from #544

• BooleanField model fields should have a default value. This is not the case for all our BooleanFields.
• Remove URL encoding from reverse() arguments. There are a couple of instances in the code where we encode args to reverse().
• Bullets 2 and 3 under Miscellaneous should be checked.
  • If your CSS/Javascript code used to access HTML input widgets by type, you should review it as type='text' widgets might be now output as type='email', type='url' or type='number' depending on their corresponding field type.
  • Form field’s error_messages that contain a placeholder should now always use a named placeholder.
• We use the get_(add|change|delete)_permission model _meta methods in a few places in the admin. This must be fixed.
• Rename get_query_set().
• Check for ModelForms without fields or exclude.
• Run the check management command. Possibly as a post-deployment verification step.
• Use persistent DB connections.
• Update TastyPie