Fixed up email job alerting system. Texting only works with Verizon.

Email alerting was a bit buggy; seems to be working now for a wide range of email types (.com,.edu). Texting works for Verizon numbers only. Need to think about how to implement this for any arbitrary number in any country for any provider.
The docstring here should conform to astropy/numpy standards, e.g.:
```
Parameters
------------
interval : int
   [description]
```
etc.