Changes for String::PerlIdentifier

Nov 18 2005
Finished version 0.02.

Nov 19 2005
Finished version 0.03.  First CPAN upload, under name String::MkVarName.

Nov 25 2005
Finished version 0.04.  On advice of brian d foy, name was changed to
String::PerlIdentifier.

Apr 21 2006
Finished version 0.05.  Added 'no underscores' option and related tests and
documentation.