Merge pull request #1 from alexz707/ExchangeRateDefaultBug

Change default value of exchange rate

Switch to PSR

Remove composer.lock

Lib update

Lib update

Fix sending invoice emails via bulk command

Fixed codestyle, added ConfigAbstractFactory to reduce the files, fix…

…ed tests

changed product tax settings according to update 3.4.0

change duedate from string to datetime

added taxratemanager, fixed invoice vars