ControllerLinkBuilder does not correctly decode special chars

Unfortunately, slashes and special characters don't get encoded if you build a link via ControllerLinkBuilder.

Paste into ControllerLinkBuilderFactoryUnitTest

@Test
public void linksToMethodWithPathVariableContainingSpecialChars() {
    Link link = linkTo(methodOn(ControllerWithMethods.class).methodWithPathVariable(":/+:) = :)")).withSelfRel();
    assertThat(link.getRel(), is(Link.REL_SELF));
    assertThat(link.getHref(), endsWith("/something/%3A%2F%20%3A)%20%3D%20%3A)/foo"));
}

Expected: a string ending with "/something/%3A%2F%20%3A)%20%3D%20%3A)/foo"
but: was "http://localhost/something/:/+:)%20=%20:)/foo"

@Test
public void linksToMethodContainingSpecialChars() {
    Link link = linkTo(methodOn(ControllerWithMethods.class).methodWithRequestParam(":/+:) = :)")).withSelfRel();
    assertThat(link.getRel(), is(Link.REL_SELF));
    assertThat(link.getHref(), endsWith("/something/foo?id=%3A%2F%20%3A)%20%3D%20%3A)"));
}

Expected: a string ending with "/something/foo?id=%3A%2F%20%3A)%20%3D%20%3A)"
but: was "http://localhost/something/foo?id=:/%2B:)%20%3D%20:)"

Start with ControllerLinkBuilderFactoryUnitTest and run the two provided link-building tests to reproduce the encoding failures. Trace the linkTo and methodOn entry points used there, then verify that path-variable and request-parameter values produce the expected encoded href endings shown in the issue.