join algorithm specification is within double quotes

                 Key: PIG-1046
             Project: Pig
          Issue Type: Bug
            Reporter: Thejas M Nair

This fails -
j = join l1 by $0, l2 by $0 using 'skewed';
This works -
j = join l1 by $0, l2 by $0 using "skewed";

String constants are single-quoted in pig-latin. If the algorithm specification 
is supposed to be a string, specifying it within single quotes should be 
Alternatively, we should be using identifiers here, since these are pre-defined 
in pig users will not be specifying arbitrary values that might not be valid 

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