Let's take this SMS number cleaning thing to its logical extreme

Fixes #4833
// FREEBIE

src/org/thoughtcrime/securesms/jobs/SmsSendJob.java

@@ -95,7 +95,9 @@ public class SmsSendJob extends SendJob {
     // stripSeparator() to rigid? what will people try to send here? - see discussion on #3099
     //recipient = PhoneNumberUtils.stripSeparators(recipient);
     // minimum required to fix the issue - brackets are no dialable chars...
-    recipient = recipient.replaceAll("[\\(\\)\\s]", "");
+    if (!NumberUtil.isValidEmail(recipient)) {
+      recipient = recipient.replaceAll("[^0-9+]", "");
+    }
 
     // NOTE 11/04/14 -- There's apparently a bug where for some unknown recipients
     // and messages, this will throw an NPE.  We have no idea why, so we're just