"same as" alias support

[adam187]

Hi,

Linter doesn't recognize same as alias fot sameas test and it throws exception:

Unexpected token "name" of value "as" ("end of statement block" expected)

http://twig.sensiolabs.org/doc/tests/sameas.html

Linter from symfony doesn't throw this error.

[asm89]

We might have to stub it out.

The linter doesn't load all extensions you use in your project. We might be able to add support for that, but I haven't thought about how yet.

[asm89]

See #2. :)