initial message queue support

• adding initial message queue support, for now only Redis support see
  #120
• clean up exit code handling
  #126

added order export, support for json and various bug fixes

• Added composer.lock to fix scrutinizer #114
• Fixed CLI Excel export creating files with zero bytes #110
• Added JSON import/export functionality #109
• Added the export for orders #107 / #108 / #113
• Fixed ids of export when using the UI #106
• Renamed a behat function as the name was misguiding #105
• Fixed CLI export #102

Special thanks to https://github.com/enesaktay who contributed all improvements in this release!!!

technology preview

some smaller tweaks as well as:

• added excel exporter #96
• add exporter for ui grid criteria #81

technology preview

This release provides the core infrastructure for import and export with some examples of each already implemented. The goal of this release is to gather feedback for an eventual 1.0.0 release

see https://github.com/FriendsOfSylius/SyliusImportExportPlugin/milestone/1