Added the feature to use admin and custom admin views as the dashboard of the back-end of a component, requested in gh-148

admin/sql/updates/mysql/2.6.17.sql

@@ -0,0 +1,5 @@
+ALTER TABLE `#__componentbuilder_joomla_component` ADD `dashboard` VARCHAR(64) NOT NULL DEFAULT '' AFTER `css_site`;
+
+ALTER TABLE `#__componentbuilder_joomla_component` ADD `dashboard_type` TINYINT(1) NOT NULL DEFAULT 1 AFTER `dashboard`;
+
+UPDATE `#__componentbuilder_joomla_component` SET `dashboard_type`=1;