Admin: change titles in the user list

1.) Change Pins column to be called Added. Added is the # of items added by the user. Change Repins to Added from.

2.) Remove Friends column, we will not have friends for launch. Just follows and followers.

3.) Add user's username, email in that table.

so that it shows the user's username, email in that table.

Table header row should be:  Name     Username     Email    Added    Added from   Followers   Follows     Date Created.
Merge pull request #38 from camilotorresf/admin-users-search

Admin: change titles in the user list
Pin loaders: description optional, one link required

Now description is optional for pin loaders.
Now one of product and source links is required, not both
Pin loaders: add price_range to pins table
Pin loaders: add price range
Pin loaders: put # of items added by user
Merge pull request #39 from camilotorresf/pin-loaders

Pin loaders
added lists
added lists
Merge pull request #40 from madra/live

Added Lists
Change database to allow sub-categories

Also add a field to mark default sub-category
Categories: add new category
Show only root categories in admin
List categories and sub-categories
Edit category
Delete sub categories
Remove subcategory when adding a category
Delete a root category
Delete sub-category with multiple category for items
Delete category with multiple category for pins