Merge pull request #458 from krisrak/master

fixes ios7 button pressed effect
rebuild af.ui.css
Updated pullToRefresh style and defaults

1. changed HIDE_REFRESH_TIME to 325 to make it smoother.
2. changed css style of *_pulldown DIV to be compatible with all themes, by removing fixed background and text color.
3. added default strings for _pulldown DIV at refresh-* event triggers, it will say "Pull to Refresh", "Release to Refresh" and "Refreshing..." for events = "refresh-cancel/finish", "refresh-trigger" and "refresh-release" respectively. This will make sure there is a default string if the user does not manually set by adding pullToRefresh event handlers.
4. fixed a bug where scrollerMoveCSS in hideRefresh() had a callback param called "complete" which did not exist in the definition, removed it and added trigger at the end of hideRefresh().
updated af.scroller demo to console.log refresh events