[Console] Allowing the user answering key or value of the autocompleterValues

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11116
| License       | MIT
| Doc PR        | ~

Before:
![capture d ecran 2014-12-05 a 01 07 54](https://cloud.githubusercontent.com/assets/667519/5308827/ebaec496-7c1b-11e4-8872-5ed1f3642836.png)

After:
![capture d ecran 2014-12-05 a 01 06 53](https://cloud.githubusercontent.com/assets/667519/5308830/f0c1a534-7c1b-11e4-8da2-b8e786e34d05.png)

NB: As we want the user to be able to type either "env_1" or "Launch this and that", I offered autocompletion too on the value of the autocompletedValues.

You are so right ! The aray flip is actually not good. Let me repush that.

And yes, I'll write tests too.