Fix schema.org attributes in erb templates.

Fix schema.org attributes which were not converted correctly from the
haml templates.  These schema.org attributes are used for marking up
html pages for seo purposes.
Update bcrypt-ruby gem.

Update the bcrypt-ruby gem to 3.1.5 needed to resolve the error:
NoMethodError: undefined method `cost' for BCrypt::Engine:Class which
was seen when creating a new user object.
Remove attr_accessible from category model.

attr_accessible now deprecated in Rails 4 in favor of Strong Parameters
implemented in the controller.
Fix top nav link css.

Fix top nav link css which broke during haml to erb migration.
Set default BCrypt cost to 12 for has_secure_password.
Fix nav link css.

Fix top nav link cs in abridged layout.  This was broken in haml to erb
conversion.
Remove attr_accessible from attachemnt and image.

Remove attr_accessible from blog_attachement and blog_image classes.
This is deprecated in Rails 4 in favor of Strong Parameters.
Use Stron Parameters in category controller.

Modify the categories controller to use Rails 4 Strong Parameters
convention when creating and editing new categories.