Mpilonhle: Expose button to force syncing to happen NOW

Background:
Our current cron job only runs once every 10 minutes.  This means that there's a chance that a computer will be online, but syncing may not occur.

Changes:
* Expose a simple API endpoint for launching the `syncmodels` job (as an asynchronous process).
* Expose a button in the "eash_admin" page (on the distributed server), only when the distributed server is online.

Notes:
* With this checkin, we can expose this same button in other places / ways, if we like.
* This will be very useful for Mpilonhle, who sometimes have small windows where syncing can occur.

![image](https://f.cloud.github.com/assets/4072455/1014013/b2f9f73c-0ba2-11e3-83cc-d7a7c89855a1.png)

![image](https://f.cloud.github.com/assets/4072455/1014018/d216ede6-0ba2-11e3-9133-bbae55e7e711.png)