Use Google Guava.

git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinx4@12536 94700074-3cef-4d97-a70e-9c8c206c02f5
Rename LogMath#getInstance -> LogMath#getLogMath.

git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinx4@12537 94700074-3cef-4d97-a70e-9c8c206c02f5