added Sending... progress indicator (to email submission)

src/email.js

@@ -21,12 +21,22 @@ process.nextTick(function() {
           if (input_email && input_email.value) {
             var is_valid = check_email(input_email.value)
             if (is_valid) {
-              status_msg.className = 'info'
-              status_msg.innerHTML = "Got it, thanks"
-              setTimeout(function() { form.submit() }, 600)
-            } else {
-              input_email.value = ''
+              var progress = 0
+                , timerID  = null
               e.preventDefault()
+              status_msg.className = 'info'
+              status_msg.innerHTML = "Sending"
+              timerID = setInterval(function() {
+                if (++progress < 8) {
+                  status_msg.innerHTML += "."
+                } else {
+                  clearInterval(timerID)
+                  form.submit()
+                }
+              }, 150)
+            } else {
+              e.preventDefault()
+              input_email.value = ''
               status_msg.className = 'error'
               status_msg.innerHTML = "that doesn't look like an email address,"
                                      + "<br />please try again..."