push_git2svn.py: Include changes in copyright date when checking for difference.
push_git2svn.py: Include changes in copyright date when checking for difference.

wegamekinglc/CppAD,wegamekinglc/CppAD,kaskr/CppAD,kaskr/CppAD,wegamekinglc/CppAD,kaskr/CppAD,wegamekinglc/CppAD,wegamekinglc/CppAD,kaskr/CppAD,kaskr/CppAD