Improve EL Exceptions wrapping
------------------------------

                 Key: MYFACES-3202
                 URL: https://issues.apache.org/jira/browse/MYFACES-3202
             Project: MyFaces Core
          Issue Type: Sub-task
            Reporter: Martin Kočí
            Priority: Minor


>From MYFACES-3053 "user should see not just a cryptic stack trace, but the EL 
>expression that was being evaluated  including the part of the EL expression 
>that triggered the problem"

Myfaces utilize TagValueExpression and TagValueExpressionUEL as 
TagAtrribute-aware wrappers around EL ValueExpression. But this "context" is  
only .toString()  of TagAttribute and that prohibits user-frendly formatting of 
messages.

Provide TagAttribute instance, create TagAttributeAwareExceptionWrapper that 
will hold this instance. Clients (mainly ErrorPage) can read attributes of 
TagAttribute and format it as necessary, for example "EL expression that 
triggered the problem: " + wrapper.getTagAttribute().getValue()

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