[zanata/zanata-common] a1320c: Add comment

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zanata/zanata-common
  Commit: a1320c6be5eb39dcc76b3ae02ae8f65ad3b02db8
      https://github.com/zanata/zanata-common/commit/a1320c6be5eb39dcc76b3ae02ae8f65ad3b02db8
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2012-12-20 (Thu, 20 Dec 2012)

  Changed paths:
    M zanata-common-util/src/main/java/org/zanata/util/HashUtil.java

  Log Message:
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