fixed bug in margin method
fixed bug in margin method


git-svn-id: 4489422e717a9d9a20f845fa74f887778ecd2ec5@172 ab4c0b43-f447-0410-ac63-8f6eca9f32e0

svn2github/google-chartwrapper-3OCT13,svn2github/googlechartwrapper,svn2github/google-chartwrapper,svn2github/googlechartwrapper,svn2github/google-chartwrapper-3OCT13,svn2github/google-chartwrapper