Deleted Tests

Conflicts:
	tests/PayloadTest.php
Update PHPUnit Version
Check NUID for changes and flush buffer if neccesary (closes #24)

- If the NUID ever changes flush the current buffer and set a new NUID
to check against.
Implement multiple buffers for multiple nuids concurrently (closes #24)
Needed pointer to $buffer to be able to edit values
Remove nuid being set in header of Request