fixed wrong decoding per gzuncompress in gzipdecoder while using gzencode in gzipencoder
fixed tests
modified call to 7z-executable from using php proc_open to symfony's processBuilder
added dependency symfony/process to composer.json
corrected parameter-annotation of transcode.php::transcode()
modified constructors of sevenzDecoder/Encoder to have only one string-argument with the 7z-executable and instantiate ProcessBuilder directly instead of using dependencyInjection
replaced method sevenzDecoder/Encoder::setInput with directly setting data-property
Merge pull request #6 from gwelters/feature/sevenzip-processbuilder

Feature/sevenzip processbuilder