stripes:label tag should check its body first when searching its value to 
render.
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                 Key: STS-580
                 URL: http://www.stripesframework.org/jira/browse/STS-580
             Project: Stripes
          Issue Type: Improvement
          Components: Tag Library
    Affects Versions: Release 1.5
         Environment: n/a
            Reporter: Iwao AVE!
            Priority: Minor


Currently, the stripes:label tag searches its value in the following order when 
it is rendered.

- resource: {actionFQN}.{name}
- resource: {actionPath}.{name} (deprecated)
- resource: {name}
- The body of the label tag
- A warning message telling you to supply a label value somewhere!

I suggest that it should check the body first for efficiency and flexibility.
Consider the following form.

Billing Address:
  <ss:label name="billingAddress.state" />: <ss:text 
name="billingAddress.state" />
Shipping Address:
  <ss:label name="shippingAddress.state" />: <ss:text 
name="shippingAddress.state" />

Although both fields should have the same caption 'State' in the form, I would 
like to display different name for each field in the validation error message.
e.g.
  Billing Address: State is required.
  Shipping Address: State is required.

If the body of the tag is searched first when it is rendered, I can write the 
form as follows.

Billing Address:
  <ss:label name="billingAddress.state">State</ss:label>: <ss:text 
name="billingAddress.state" />
Shipping Address:
  <ss:label name="shippingAddress.state">State</ss:label>: <ss:text 
name="shippingAddress.state" />

And the StripesResources.properties will have entries like below.

billingAddress.state=Billing Address: State
shippingAddress.state=Shipping Address: State

# I assume that this change does not require anything special when the same 
string can be used for caption and validation error message (i.e. backward 
compatible).

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