using \CurlFile on php >= 5.5
bug #22 Remove deprecation message on PHP 5.5 (pschultz)

This PR was merged into the master branch.

Discussion
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Remove deprecation message on PHP 5.5

Using `@filename` in [CURLOPT_POSTFIELDS is deprecated in PHP 5.5][1]. This PR uses the new `\CurlFile` class instead, removing two Deprecation messages that appear when running the `security:check` command.

[1]: http://php.net/manual/en/function.curl-setopt.php

Commits
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069c99a using \CurlFile on php >= 5.5