feat(cucumber): Allow cucumber tests containing line numbers

example:
specs: [
    'cucumber/lib.feature:7'
  ]

Author: karthiktv006

lib/configParser.js

@@ -96,12 +96,21 @@ ConfigParser.resolveFilePatterns =
 
   if (patterns) {
     for (var i = 0; i < patterns.length; ++i) {
-      var matches = glob.sync(patterns[i], {cwd: cwd});
+      // Cucumber allows running a spec given a line number. See
+      // https://github.com/angular/protractor/issues/2413
+      var fileName = patterns[i].split(':')[0],
+          lineNumber = patterns[i].split(':')[1],
+          matches = glob.sync(fileName, {cwd: cwd});
+
       if (!matches.length && !opt_omitWarnings) {
         log.warn('pattern ' + patterns[i] + ' did not match any files.');
       }
       for (var j = 0; j < matches.length; ++j) {
-        resolvedFiles.push(path.resolve(cwd, matches[j]));
+        var resolvedPath = path.resolve(cwd, matches[j]);
+        if(lineNumber) {
+          resolvedPath += ':' + lineNumber;
+        }
+        resolvedFiles.push(resolvedPath);
       }
     }
   }