introduce signal, start using in history; use consts for signal name

introduces two new modules:
scripts/consts.js
scripts/signal.js

signal is a thin wrapper for jquery('window').on and
jquery('window').trigger, which seems like an adaquete signal library -
there are faster things around, but why introduce another dependency.

1 files changed, 5 insertions, 0 deletions

diff --git a/scripts/consts.js b/scripts/consts.js
new file mode 100644
index 00000000..927a30d3
--- /dev/null
+++ b/scripts/consts.js
@@ -0,0 +1,5 @@
+define('consts', function() {
+    return {
+        RECORD_LINKS: 'record_links',
+    };
+});