Adding cpplint.

third_party/google-styleguide/cpplint/README

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+This is automated checker to make sure a C++ file follows Google's C++ style
+guide (http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml). As it
+heavily relies on regular expressions, cpplint.py won't catch all violations of
+the style guide and will very occasionally report a false positive. There is a
+list of things we currently don't handle very well at the top of cpplint.py,
+and we welcome patches to improve it.
+
+The linting tool takes a list of files as input. For full usage instructions,
+please see the output of:
+
+  ./cpplint.py --help
+
+Unit tests are provided in cpplint_unittest.py. This file can safely be ignored
+by end users who have downloaded this package and only want to run the lint
+tool.
+
+---
+
+cpplint.py and its corresponding unit tests are Copyright (C) 2009 Google Inc.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.