Run cpplint as part of our CI build

This will help ensure a consistent C++ coding style.

brightray/script/cpplint

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+
+import fnmatch
+import os
+import subprocess
+import sys
+
+
+SOURCE_ROOT = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
+CPPLINT = os.path.join(SOURCE_ROOT, 'vendor', 'google-styleguide', 'trunk', 'cpplint', 'cpplint.py')
+
+
+def main():
+  os.chdir(SOURCE_ROOT)
+  files = list_files(['browser', 'common'],
+                     ['*.cc', '*.mm', '*.h'])
+  return cpplint(files)
+
+
+def list_files(directories, filters):
+  matches = []
+  for directory in directories:
+    for root, _, filenames, in os.walk(directory):
+      for f in filters:
+        for filename in fnmatch.filter(filenames, f):
+          matches.append(os.path.join(root, filename))
+  return matches
+
+
+def cpplint(files):
+  rules = '--filter=-build/header_guard'
+  return subprocess.call([sys.executable, CPPLINT, rules] + files)
+
+
+if __name__ == '__main__':
+  sys.exit(main())