admin-ui: Fix JS bug

Fix apyrgio/synnefo#158
admin-ui: Add icon-font with kpal's icons
admin-ui: Update the class name of font icons

Now, there are two fonts and two classes that uses them:
* snf-font-admin
* snf-font
admin-ui: Add a devider in the dropdowns of subnav
Merge branch 'feature-admin-ui-new' into feature-admin