Add fuzzy dates with lw-timeago

Fixes #14
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2c5f24e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "static/js/lw-timeago"]
+	path = static/js/lw-timeago
+	url = https://github.com/pR0Ps/lw-timeago.git