Enhanced Version Detection (Again) (#144)

* Simpler approach to EVD

* Download notifs now have progress bars

* Removed unused import, changed some comments

* Re-added "Please Wait" on Apps list (accidentally removed)

* Updated README.md

lib/providers/source_provider.dart

@@ -248,7 +248,7 @@ class SourceProvider {
     }
     for (int i = 0; i < parts.length - 1; i++) {
       if (RegExp('.*[A-Z].*').hasMatch(parts[i])) {
-        // TODO: RegEx won't work for non-eng chars
+        // TODO: Look into RegEx for non-Latin characters
         return false;
       }
     }