Give warning when using capturing patterns with the AntPathMatcher

[dsyer]

This fails:

@GetMapping("/resource/{*tail}")
public Object statics(@PathVariable String tail) {...}

with

Required URI template variable 'tail' for method parameter type String is not present

In fact what you need is

@GetMapping("/resource/{*tail}")
public Object statics(@PathVariable("*tail") String tail) {...}

This isn't really obvious from either the error message or the docs. Maybe we should support the first variant anyway?

[poutsma]

I can't reproduce this. With the following handler method:

@GetMapping("/resources/{*tail}")
	public String handle(@PathVariable String tail) {
		return tail;
	}

a request for /resources/foo/bar/baz returns /foo/bar/baz.

[poutsma]

This issue was probably due to using the default AntPathMatcher in combination with a capturing pattern ({*foo}). We should throw an exception when users do so.