Perf: remove <time-element>

Performance profile revealed alot of time spent in the `<time-element>`'s `ExtendedTimePrototype.getFormattedTitle()`...

![screen shot 2014-11-24 at 11 03 00 pm](https://cloud.githubusercontent.com/assets/284734/5178291/cf39bd9c-742e-11e4-92a6-174a3fc9f813.png)

Removing this element for a simpler `timeAgo` filter reduces rendering the relative time to a millisecond...

![screen shot 2014-11-24 at 11 16 49 pm](https://cloud.githubusercontent.com/assets/284734/5178394/1c051ada-7430-11e4-80f5-acf206d4d9e0.png)