updated google analytics tracker code from urchin.js to ga.js
updated google analytics tracker code from urchin.js to ga.js



Former-commit-id: 076af2b49ae4b995937f89beec3d69affab0887e
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine