Layout responds to change in first tile width.

Uses itemWidth if set, but uses new tile width if it has changed otherwise.
Layout responds to first tile width. (min.js)
Refresh trigger to layout content which starts off hidden.
$('#container').trigger('refreshWookmark') causes manual refresh, for used with tabbed content.
Prevented wookmark from attempting layout with 0 columns.
Merge branch 'master' of https://github.com/Jamedjo/Wookmark-jQuery

Conflicts:
	jquery.wookmark.js
	jquery.wookmark.min.js
Working on new bug fix version.
Git is strange.