title: enabling cpp header file checking with syntastic in vim
body: <p>I just started using syntastic for vim, and I'm loving it so far, but I have one tiny issue.  If the file extension is not cpp, running ":SyntasticCheck" does absolutely nothing.  This is a problem, as I would like to run syntastic on header files as well, with extensions such as ".h" or ".hpp".  Can anyone help me out?  I'm using 'gcc' as my cpp syntastic-checker, if that helps.</p>