feature #35 improve error message for PHP < 5.4 (xabbuh)
feature #35 improve error message for PHP < 5.4 (xabbuh)

This PR was merged into the 1.0-dev branch.

Discussion
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improve error message for PHP < 5.4

When the user uses a PHP version smaller than 5.4, they are not able
to use the Symfony Installer. Instead, they are presented a nice error
message telling them to use the `composer create-project` command
instead. However, if that command is executed without a version
number, the user will get the latest stable release of the Symfony
Standard Edition. Especially when the user passed a custom version
number to the Symfony Installer, this might not be the desired
version. Therefore, it is reasonable to pass the required version
number to Composer.

Commits
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11a072c improve error message for PHP < 5.4

TheKnarf/symfony-installer,symfony/symfony-installer,javiereguiluz/symfony-installer,jzawadzki/symfony-installer