Fixes #1390. Modify karma.conf.js to allow passing in a KARMA_SPECS env var to...

Fixes #1390. Modify karma.conf.js to allow passing in a KARMA_SPECS env var to only run just those test specified

karma.conf.js

@@ -49,10 +49,9 @@ module.exports = function(config) {
       'js/src/utils/*.js',
       // spec
       'spec/**/*.stub.js',
-      'spec/**/*.js',
       {pattern: 'spec/data/*', watched: true, served: true, included: false},
-      {pattern: 'spec/fixtures/*json', watched: true, served: true, included: false},
-    ],
+      {pattern: 'spec/fixtures/*json', watched: true, served: true, included: false}
+    ].concat(!process.env.KARMA_SPECS ? ['spec/**/*.js'] : process.env.KARMA_SPECS.split(',')),
 
 
     // list of files to exclude