Apply php dev best practices

[EHJ-52n]

• Replace short open tags with long version
• Remove closing tag at end of files

Fixes #110

http://php.net/manual/en/language.basic-syntax.phptags.php

[EHJ-52n]

You should apply this PR somehow to the dev branch, too.

[matthesrieke]

urgs :) other way would have been easier

[EHJ-52n]

You are right. :sunglasses: