Make spaces great again

[Steveb-p]

Fixes #170

[ankitpokhrel]

@Steveb-p thanks for the PR, can we also make the test great again 😄 : https://github.com/ankitpokhrel/tus-php/blob/master/tests/RequestTest.php#L147-L158

[Steveb-p]

@ankitpokhrel Adjusted. Now with 100% crispy tests.

Other approach to testing filenames might be using pathinfo function to check it.

[steveb@xxx tus-php]$ php -r "var_dump(pathinfo('#test test2x.php'));"
array(4) {
  ["dirname"]=>
  string(1) "."
  ["basename"]=>
  string(16) "#test test2x.php"
  ["extension"]=>
  string(3) "php"
  ["filename"]=>
  string(12) "#test test2x"
}
[steveb@xxx tus-php]$ php -r "var_dump(pathinfo('../../#test test2x.php'));"
array(4) {
  ["dirname"]=>
  string(5) "../.."
  ["basename"]=>
  string(16) "#test test2x.php"
  ["extension"]=>
  string(3) "php"
  ["filename"]=>
  string(12) "#test test2x"
}

[ankitpokhrel]

@Steveb-p thanks, this should work for now :)