Better error when creating an element without a hyphenated name

If you run the following example, you get an error because the custom element does not have a hyphen in the name.

index.html

<html>
<script src="polymer-v0.0.20130912/polymer-v0.0.20130912.min.js"></script>
<link rel="import" href="element.html">
<element/>

element.html

<polymer-element name="element">
    <template>
    </template>
    <script>Polymer('element');</script>
</polymer-element>

However, the error has no message, so if you do this by accident it is difficult to work out what has gone wrong.

The error message does have a useful message as of googlearchive/CustomElements@315f9a4.

It looks like the build ate the nice message for some reason.
From my initial testing, it seems to have been fixed it in trunk.

Should be fixed in today's release version.

Currently, creating custom element without hyphen in the name ends with Uncaught Error:

Which I think is enough descriptive to understand what we have done wrong, so an issue can be closed now.

Agreed, thx

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