remove IE{6,7} CSS customizations, we can't test and usage is low
Take advantage of asset pipeline for some core assets [THEME] [DEPLOY]

Removed some core assets (jquery, jquery-ui, formtastic) that are
automatically provided by gems; before the asset pipeline, assets had to be
copied across to the project directory by hand or via *:install rake tasks.

Removed some assets that didn't appear to be used by anything such as
reset-fonts-grids.css, jquery.dimensions.min.js.

[THEME] The 'reset' stylesheet was moved to core, it is unlikely you would
need or want to update this manually.  'common' and 'formtastic' core
stylesheets have been merged into the 'application' stylesheet.

  Change the following lines in themes/*/views/layouts/application.html.erb:
    <%= theme_stylesheet_link_tag 'reset', :media => :all %>
    <%= stylesheet_link_tag 'common', 'formtastic', :media => :all %>
  to look like:
    <%= stylesheet_link_tag 'application', :media => :all %>