Make some name validation errors warnings.

utils/pub/validator/name.dart

Index: utils/pub/validator/name.dart
diff --git a/utils/pub/validator/name.dart b/utils/pub/validator/name.dart
index 249a0c9ee76e2907d4c700d9e2424c0e296d9066..a7b69dd4e87e7f9ba386ad41594a11053b7ec564 100644
--- a/utils/pub/validator/name.dart
+++ b/utils/pub/validator/name.dart
@@ -66,14 +66,14 @@ class NameValidator extends Validator {
     if (name == "") {
       errors.add("$description may not be empty.");
     } else if (!new RegExp(r"^[a-zA-Z0-9_]*$").hasMatch(name)) {
-      errors.add("$description may only contain letters, numbers, and "
+      warnings.add("$description may only contain letters, numbers, and "
           "underscores.\n"
           "Using a valid Dart identifier makes the name usable in Dart code.");
     } else if (!new RegExp(r"^[a-zA-Z]").hasMatch(name)) {
-      errors.add("$description must begin with letter.\n"
+      warnings.add("$description must begin with letter.\n"
           "Using a valid Dart identifier makes the name usable in Dart code.");
     } else if (_RESERVED_WORDS.contains(name.toLowerCase())) {
-      errors.add("$description may not be a reserved word in Dart.\n"
+      warnings.add("$description may not be a reserved word in Dart.\n"

[nweiz, 2013/02/20 19:41:02]

These should still be errors for package names.

[Bob Nystrom, 2013/02/20 21:13:40]

Done.

[nweiz, 2013/02/20 21:25:02]

I meant all of the newly-warning'd errors, not just this one in particular.

           "Using a valid Dart identifier makes the name usable in Dart code.");
     } else if (new RegExp(r"[A-Z]").hasMatch(name)) {
       warnings.add('$description should be lower-case. Maybe use '