Date should not be a string

Removed quotes around the date. Added some comments for clarity.

bin/post-sgv.sh

@@ -1,9 +1,10 @@
 #!/bin/sh
-#  "date": "1413782506964"
+# Date is epoch in nanosecods...ie linux echo $(($(date +%s%N)/1000000))
+# $API_SECRET needs to be a hashed value of your secret key...ie linux echo -n "<API_SECRET>" | sha1sum
 
 curl -H "Content-Type: application/json" -H "api-secret: $API_SECRET" -XPOST 'http://localhost:1337/api/v1/entries/' -d '{
   "sgv": 100,
   "type": "sgv",
   "direction": "Flat",
-  "date": "1415950912800"
+  "date": 1449872210706
 }'