Refactored the Pinata::Project spec.
Make raw results available from Pinata::Project

To support ResultsTable
Small refactoring of ResultsTable

* Changed #each to #each_row
* Added a headers method to return column headers.
Refactoring of Pinata::Reporters::Stream

* Extracted common reporter code to Pinata::Reporters::Base
* Renamed Pinata::Reporters::Stream to Pinata::Reporters::Default
* Modified Pinata::Reporters::Default's output
Extracted common stream spec helper.
Added Pinata::Reporters::DetailsTable