Fix tests that fail on HHVM due to inconsistencies with Zend on key()

https://github.com/facebook/hhvm/blob/master/hphp/doc/inconsistencies#L23

HHVM does not reset the internal array cursor when an array is copied. Zend 5.5
does, so when an array is passed to a function (like `$sample_data` in the fixed
tests) the internal cursor is reset. For 5.6 the maintainers have specified that
how the internal cursor is copied is an implementation detail and may change without
warning. So it's best to be explicit and not rely on key() or current() at all.

I just fixed the tests for which this causes problems on HHVM as part of the effort
to get klein.php to 100% for HHVM.
Fix nits: obj->id instead of obj->{"id"}
Renaming an old mis-named test
Merge branch 'fix-failing-tests-on-hhvm-using-key' of https://github.com/RafeKettler/klein.php into bugfix/test-cleanup
Fixing the redundancy in tests and converting to
single quotes
Single quotes, pls
Merge pull request #220 from Rican7/bugfix/test-cleanup

Bugfix - Test cleanup