Set up Segment.io

Previously, everytime we wanted to add a new monitoring service to the application we would have to add another snippet, which was proving to be cumbersome. Segment.io has been added so that we only need one snippet for all monitoring services.

https://trello.com/c/lLzZEqTb

![](http://www.reactiongifs.com/r/tumblr_mwq1hi1dEZ1rvn6njo1_4001.gif)