removing jQuery UI JS & CSS from the public controller

it's always added in base, so we check for it and remove it
also moved the @import from base.scss to private.scss
Merge branch 'refs/heads/kohana_v3.3/feature/public_no_jquery_ui' into kohana_v3.3/master
changing the default image float L/R margin

to use $grid_pad
Merge branch 'refs/heads/kohana_v3.3/feature/css_img_margin' into kohana_v3.3/master