Add support for static method calls via self and static.  Fixes #1.

This doesn't fix all ways of calling a static method of course, but that
should be the primary method of calling a static method.  For example,
the following would still not be caught:

class Foo
{
    public static function bar()
    {
        Foo::bar();
    }
}
Fix indentation.
Merge pull request #2 from nubs/master

Add support for static method calls via self and static. Fixes #1