Add additional specification for the merge class
Add getTrackedList()

It returns an array of and/or'd search results ready for use with the
twitter api
Use internal merge lib
A search can have a location
Move streamTweets in the file
Move tweet parsing logic to a separate module
Lowecase merge

It's not an object
remove old getTrackedList tests
Refactor start method into several pieces
Delete logic moved to external class
BDD for tweet lib
Tweaks to the streamTweets function