Routing options

Bug fix: no
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: #5989, #5990, #6049
License of the code: MIT

In #5989, it has unanimously been decided to renamed `hostname_pattern` to `hostname` and `pattern` to `path`. That makes a lot of sense and I would like to do the renaming now as `hostname_pattern` is new in Symfony 2.2, so I'd like to avoid breaking BC just after the release. As we are modifying the route options, I've also included changes introduced by @Tobion in #6049 which were discussed in #5990.

As everything is BC, I think it's wise to include that in 2.2. What do you think?