suggest to use symfony.phar on Windows
minor #67 suggest to use symfony.phar on Windows (xabbuh)

This PR was merged into the 1.0-dev branch.

Discussion
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suggest to use symfony.phar on Windows

The command that is suggested since #59 when the download of a non-existent Symfony version fails, is not sufficient on Windows. We need to suggest `php symfony.phar ...` instead.

Commits
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6a7324d suggest to use symfony.phar on Windows