fix(runner): do not error out if only one spec pattern does not match any files

Previously, the runner would throw an error if any one of the spec patterns did not
match any files. Now it logs a warning in that case, and errors out only if there
are no found files in any spec patterns. Closes #260

Author: juliemr

lib/runner.js

@@ -181,12 +181,15 @@ var runJasmineTests = function() {
   for (var i = 0; i < specs.length; ++i) {
     var matches = glob.sync(specs[i], {cwd: config.specFileBase});
     if (!matches.length) {
-      throw new Error('Test file ' + specs[i] + ' did not match any files.');
+      util.puts('Warning: pattern ' + specs[i] + ' did not match any files.');
     }
     for (var j = 0; j < matches.length; ++j) {
       resolvedSpecs.push(path.resolve(config.specFileBase, matches[j]));
     }
   }
+  if (!resolvedSpecs.length) {
+    throw new Error('Spec patterns did not match any files.');
+  }
 
   minijn.addSpecs(resolvedSpecs);
   // TODO: This should not be tied to the webdriver promise loop, it should use