Feature: MBTA plugin

Completed a WordPress plugin that gets the current status of a MBTA stop. The plugin uses WordPress shortcodes to display the data.



Examples:
```
[mbtastatus line="orange" stop="Ruggles"]
[mbtastatus line="red" stop="Park Street"]
```
In the post editor
![image](https://cloud.githubusercontent.com/assets/930169/2704469/ceae1646-c46d-11e3-84e4-d6799f9f8fce.png)

I promise it works, but gosh darn T shuts down early.
![image](https://cloud.githubusercontent.com/assets/930169/2704476/efaf52ce-c46d-11e3-923c-9e94cdf43486.png)

Currently, the plugin works better on the website than on displays: 
* Google fonts do not display correctly on DDS.
* 'No Trains Running' prompt does not display on DDS.