Update Package.php

[rolffujino]

• Replaced the file mime type variable with the output from an accurate function
• Added a check to ensure that a file is actually an uploaded file and not a trick to point at a local file
• Improved the invalid package check so that it not just checks the mime type but also ensure that mime type matches the repo
• Added a check in case no files are uploaded * Moved the target directory creation behind the no errors check to prevent the folder being created needlessly and never tidied up

[lbr38]

Nothing to say, this is clean work. Tested and approved.

Thank you very much :-)