fixed hook signatures to ensure 2.0 compatibility.
added a css file for admin form
Merge remote branch 'issue_1/issue_1'

Conflicts:
	config_form.php
	plugin.php
merged with issue_1 fix
Merge branch 'master' into issue_1.  Add hack to handle AddThis body id naming conflict.  Add options to control whether toolbars appear on item and collection pages.  Issue #1