Sonar is for code metrics, and is usually installed on a build server. It requires a database as well as access to a code repository. By default it uses localhost:9000.
A spike is a (usually timeboxed) experimental activity (usually by developers) to calibrate time estimates about new technology by gaining experience with that technology.
I am currently unable to find mentions of using Sonar with Apache Buildr.
Future TWUers: the food at the office is quite good, although it can be difficult to get used to if you are accustomed to a significantly divergent foodgroup norm. It is possible to order out for lunch either in a group or individually. In the pantries, you will find juice, soda pop, milk, bread, and snack items like chips and popcorn, as well as quite nice coffeemakers.