chore(jqLite): remove special characters from the expando property
chore(jqLite): remove special characters from the expando property

Having special characters in the expando property created a memory bloat.
See https://code.google.com/p/chromium/issues/detail?id=378607#c6 to reproduce

Closes #7701

campersau/angular.js,campersau/angular.js