Add 'Manage in Customizer' button for Settings. See #516.

.gitignore

@@ -15,4 +15,5 @@ wp-config.php
 .DS_Store
 node_modules
 .svn
-.git
+.git
+release.sh

wpsc-admin/settings-page.php

@@ -511,6 +511,18 @@ public function display() {
 				<div id="icon_card" class="icon32"></div>
 				<h2 id="wpsc-settings-page-title">
 					<?php esc_html_e( 'Store Settings', 'wp-e-commerce' ); ?>
+					<?php
+						if ( current_user_can( 'customize' ) ) :
+							printf(
+							' <a class="page-title-action hide-if-no-customize" href="%1$s">%2$s</a>',
+							esc_url( add_query_arg( array(
+							array( 'autofocus' => array( 'panel' => 'wpsc' ) ),
+							'return' => urlencode( wp_unslash( $_SERVER['REQUEST_URI'] ) ),
+							), admin_url( 'customize.php' ) ) ),
+							__( 'Manage in Customizer' )
+							);
+						endif;
+					?>
 					<img src="<?php echo esc_url( wpsc_get_ajax_spinner() ); ?>" class="ajax-feedback" title="" alt="" />
 				</h2>
 				<?php $this->output_tabs(); ?>
@@ -726,4 +738,4 @@ function _wpsc_action_after_settings_tab() {
 	<input type='hidden' name='wpsc_admin_action' value='submit_options' />
 	<?php
 	wp_nonce_field( 'update-options', 'wpsc-update-options' );
-}
+}