added extended categories widget

.../plugins/extended-categories-widget/2.8/avh-ec.client.php

...ins/extended-categories-widget/2.8/class/avh-ec.admin.php

...ded-categories-widget/2.8/class/avh-ec.category-group.php

...gins/extended-categories-widget/2.8/class/avh-ec.core.php

...s/extended-categories-widget/2.8/class/avh-ec.widgets.php

...ugins/extended-categories-widget/2.8/css/avh-ec.admin.css

...gins/extended-categories-widget/2.8/css/avh-ec.widget.css

...gins/extended-categories-widget/2.8/helpers/avh-forms.php

...d-categories-widget/2.8/images/us_banner_logow_120x60.gif

...nded-categories-widget/2.8/js/avh-ec.categorygroup.dev.js

...extended-categories-widget/2.8/js/avh-ec.categorygroup.js

...ugins/extended-categories-widget/2.8/lang/avh-ec-cs_CZ.mo

...ugins/extended-categories-widget/2.8/lang/avh-ec-de_DE.mo

.../plugins/extended-categories-widget/2.8/lang/avh-ec-el.mo

...ugins/extended-categories-widget/2.8/lang/avh-ec-es_ES.mo

...ugins/extended-categories-widget/2.8/lang/avh-ec-id_ID.mo

...ugins/extended-categories-widget/2.8/lang/avh-ec-it_IT.mo

...ugins/extended-categories-widget/2.8/lang/avh-ec-nl_NL.mo

...ugins/extended-categories-widget/2.8/lang/avh-ec-ru_RU.mo

...ugins/extended-categories-widget/2.8/lang/avh-ec-sv_SE.mo