Acl: combine Generate and Sync as a btn-dropdown
Croogo: icon-large as default icon size

Croogo::adminRowAction() already uses icon-large, however the default
CroogoHtml::icon() does not.

This change makes it uniform and use icon-large as default as it is
easier to align, especially within item-actions container.
Revert "centering icons in item-actions"

This reverts commit dc0e339e332e01b43071f97b738f23ec07f062fa.

The proper solution is to use <i> tag instead of embedding 'icon-*'
in element class attribute.
Croogo: default width for 'item-actions' icons

See:
8ce3c05560 Croogo: icon-large as default icon size
475d470187 Revert "centering icons in item-actions"
Merge branch '1.5-icons' into 1.5