Add Meta Informations to the common Message object

[damienalexandre]

See php-translation/loco-adapter#7 and FriendsOfApi/localise.biz#16.

This PR adds Meta informations from the Data Collector Message to the Common Message object. This allow the Loco-Adapter to use this Meta information in order to add the parameters as notes on newly created assets.

Screenshot

[rvanlaak]

Seems better to me to add parameters, count and transChoiceNumber to the Message value object as fields.

[damienalexandre]

Maybe, I'm not sure: the Message object is a common objet used to represent a translation on the storage, and those parameters, count and transChoiceNumber information are only needed when displaying a translation.

[damienalexandre]

Do not merge I still have a cleanup to do:

[Nyholm]

Great. This looks good. I merged the two downstream PRs and tagged new releases.

[damienalexandre]

Clean up done, as the profiler was storing all the parameters from all the calls to a translation, the dumped version could become heavy; I reduce the array to only have one occurrence of each parameter key.

[Nyholm]

Feel free to drop support for HHVM. Symfony has officially dropped it.

[damienalexandre]

HHVM dropped, but there is a PHP7 syntax error now 😬 https://travis-ci.org/php-translation/symfony-bundle/jobs/238027526
Can't find it!

[Nyholm]

Two things:

1. Twig fucked up

2. We are installing dev and not releases. We should use:

     - travis_retry composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction		

[damienalexandre]

Launched the builds again and it's green 👍