shortcut to open link in background (fix #179)

src/main/resources/i18n/en.properties

@@ -109,6 +109,7 @@ about.shortcuts.focus_next_entry=set focus on next entry without opening it
 about.shortcuts.focus_previous_entry=set focus on previous entry without opening it
 about.shortcuts.open_close_current_entry=open/close current entry
 about.shortcuts.open_current_entry_in_new_window=open current entry in a new window
+about.shortcuts.open_current_entry_in_new_window_background=open current entry in a new window in the background
 about.shortcuts.star_unstar=star/unstar current entry
 about.shortcuts.mark_current_entry=mark as read/unread current entry
 about.shortcuts.mark_all_as_read=mark all entries as read

src/main/webapp/js/controllers.js

@@ -759,6 +759,19 @@ function($scope, $stateParams, $http, $route, $window, EntryService, SettingsSer
 			window.open($scope.current.url);
 		}
 	});
+	Mousetrap.bind('b', function(e) {
+		if ($scope.current) {
+			var url = $scope.current.url;
+			var a = document.createElement('a');
+			a.href = url;
+			var evt = document
+					.createEvent('MouseEvents');
+			evt.initMouseEvent('click', true, true,
+					window, 0, 0, 0, 0, 0, true, false,
+					false, false, 0, null);
+			a.dispatchEvent(evt);
+		}
+	});
 	Mousetrap.bind('s', function(e) {
 		$scope.$apply(function() {
 			if ($scope.current) {

src/main/webapp/templates/_shortcuts.html

@@ -17,6 +17,9 @@
 	<dt>v</dt>
 	<dd>${about.shortcuts.open_current_entry_in_new_window}</dd>
 	
+	<dt>b</dt>
+	<dd>${about.shortcuts.open_current_entry_in_new_window_background}</dd>
+	
 	<dt>s</dt>
 	<dd>${about.shortcuts.star_unstar}</dd>