Include a way to explicitly define a hash constant for each primitive type, 
along with the functionality described in LANG-411
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                 Key: LANG-627
                 URL: https://issues.apache.org/jira/browse/LANG-627
             Project: Commons Lang
          Issue Type: Improvement
          Components: lang.*
    Affects Versions: 3.0
            Reporter: Michael Sean Mickey
            Priority: Minor


Regarding LANG-411, the description mentions 2 parameters for each hash 
operation: the first a parameter to hold the type instance to be hashed, the 
second a hash multiplier.

Shouldn't there also be a way to define a specific hash constant value as well? 
Joshua Bloch refers to this value as the starting value for "result" in his 
examples and the HashCodeBuilder code maintains an internal field named: iTotal 
for this value. It doesn't seem to make sense to add a parameter to the hashing 
operations for a starting hash constant value, but it probably makes sense to 
add mutators that allow setting this value across any given type. For example: 
setIntHashConstant, setBoolHashConstant, setLongHashConstant, etc. Default 
values could be defined so that explicit hash constants are not required.

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