Option to define header file extensions to cpplint

[GoogleCodeExporter]

Currently cpplint doesn't recognize .hpp as a header file extension and do not 
perform all tests to the file.

Proposal is to add "--headers=extension, extension,..." option that defines the 
file extensions which are used for identifying the header files.

Attached patch adds the option and it has been tested with cmake and Visual 
Studio 2013.   

Original issue reported on code.google.com by [email protected] on 1 Oct 2014 at 7:34

Attachments:

• cpplint.py.--headers.patch