Measure coverage for api, runtime and spec js tests

Instrument spec.js for test coverage
measurement.

.jshintignore

 node_modules/**
+test/coverage/html

scripts/coverage.js

@@ -25,8 +25,8 @@ function coverage() {
           mkdirp(path.join('coverage', 'html'), function(err) {
             if (err) { throw err; }
             collector.add(cov);
-			summary.writeReport(collector);
-			html.writeReport(collector);
+            summary.writeReport(collector, true);
+            html.writeReport(collector, true);
             lcov.on('done', function() {
               fs.readFile(path.join('coverage', 'lcov.info'), function(err, data) {
                  if (err) { console.error(err); }
@@ -34,7 +34,7 @@ function coverage() {
                    function (err) { if (err) { console.error(err); } });
               });
             });
-			lcov.writeReport(collector);
+            lcov.writeReport(collector, true);
           });
         } else {
           console.warn('No coverage');
@@ -56,7 +56,9 @@ function coverage() {
                  instrumentedfiles.push(source);
                  if (instrumentedfiles.length === sourcefiles.length) {
                    fs.readdirSync('test').filter(function(file){
-                     return file.substr(-6) === 'api.js';
+                     return file.substr(-6)  === 'api.js' ||
+                            file.substr(-11) === 'runtime.js' ||
+                            file.substr(-7)  === 'spec.js';
                    }).forEach(function(file){
                      mocha.addFile(
                        path.join('test', file)

test/spec.js

@@ -3,7 +3,9 @@ var assert = require('assert'),
     exists = fs.existsSync,
     path = require('path'),
     read = fs.readFileSync,
-    sass = require('../lib'),
+    sass = process.env.NODESASS_COV
+      ? require('../lib-cov')
+      : require('../lib'),
     util = require('./util');
 
 describe('spec', function() {