Give more details on unit test output

This adds an output handler for Busted which reuses the built-in "utfTerminal"
handler, and augments it by showing the name of each suite/test as it is run.

spec/detailUtfTerm.lua

@@ -0,0 +1,28 @@
+#! /usr/bin/env lua
+--
+-- detailUtfTerm.lua
+-- Copyright (C) 2016 Adrian Perez <aperez@igalia.com>
+--
+-- Distributed under terms of the MIT license.
+--
+
+local colors = require 'term.colors'
+
+return function(options)
+  local busted = require 'busted'
+  local handler = require 'busted.outputHandlers.utfTerminal' (options)
+
+  handler.fileStart = function(element)
+    io.write("\n" .. colors.cyan(handler.getFullName(element)) .. ':')
+  end
+
+  handler.testStart = function(element, parent, status, debug)
+    io.write('\n   ' .. handler.getFullName(element) .. '\r ')
+    io.flush()
+  end
+
+  busted.subscribe({ 'file', 'start' }, handler.fileStart)
+  busted.subscribe({ 'test', 'start' }, handler.testStart)
+
+  return handler
+end