adding a droptables script to clean up old tables

droptables.sql

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+drop table articles_article cascade;
+drop table articles_article_followup_for cascade;
+drop table articles_article_related_articles cascade;
+drop table articles_article_sites cascade;
+drop table articles_article_tags cascade;
+drop table articles_articlestatus cascade;
+drop table articles_attachment cascade;
+drop table articles_tag cascade;
+drop table content_copy cascade;
+drop table content_designimage cascade;
+drop table content_housead cascade;
+drop table content_page cascade;
+drop table content_sidebarwidget cascade;
+drop table content_template cascade;
+drop table content_textarea cascade;
+drop table tastypie_apiaccess cascade;
+drop table tastypie_apikey cascade;
+drop table zinnia_category cascade;
+drop table zinnia_entry cascade;
+drop table zinnia_entry_authors cascade;
+drop table zinnia_entry_categories cascade;
+drop table zinnia_entry_related cascade;
+drop table zinnia_entry_sites cascade;