added chma param, fixed py version determination re:issue21
added chma param, fixed py version determination re:issue21

google-code-export/google-chartwrapper,Bulletninja/google-chartwrapper,simplyvikram/google-chartwrapper,google-code-export/google-chartwrapper,appknox/google-chartwrapper,rmgorman/google-chartwrapper,appknox/google-chartwrapper,rmgorman/google-chartwrapper,Bulletninja/google-chartwrapper,simplyvikram/google-chartwrapper,appknox/google-chartwrapper