patch Issue 129490043: Add generic GCC >= 4.7 support for atomic operations


git-svn-id: http://protobuf.googlecode.com/svn@575 630680e5-0e50-0410-840e-4b1c322b438d
Delete the additional exception catch for reflection_test


git-svn-id: http://protobuf.googlecode.com/svn@576 630680e5-0e50-0410-840e-4b1c322b438d
update 2.6.0 tar and zip under rc/


git-svn-id: http://protobuf.googlecode.com/svn@577 630680e5-0e50-0410-840e-4b1c322b438d
Change python/README


git-svn-id: http://protobuf.googlecode.com/svn@578 630680e5-0e50-0410-840e-4b1c322b438d
update tar and zip for 2.6.0


git-svn-id: http://protobuf.googlecode.com/svn@579 630680e5-0e50-0410-840e-4b1c322b438d