Possible fix: Using extend() with Moment's prototypes breaks IE < 9

https://github.com/moment/moment/issues/1114
Changed to the simpler workaround rather than full blown fix.

https://github.com/moment/moment/issues/1114#issuecomment-24629678
Adjust indentation
Merge pull request #1115 from Xotic750/extendDontEnum

extend() now works on IE < 9