#6218 - applying hotfix for `iconv.internal_encoding` deprecation

See https://wiki.php.net/rfc/default_encoding

 > PHP 5.6 and master, introduce new php.ini setting. Old iconv.*/mbstring.* php.ini parameters will be removed for master PHP6. Use of iconv.*/mbstring.* php.ini parameters raise E_DEPRECATED for 5.6 and up.
Fixes typos
Merge pull request #6219 from Ocramius/hotfix/#6218-iconv-internal-encoding-deprecated-in-php-5.6

#6218 - applying hotfix for `iconv.internal_encoding` deprecation
Merge branch 'hotfix/6219'

Close #6219
Merge pull request #6237
Merge pull request #6237 in master
Fix invalid step error caused by DST
remove unused use
CS
#6245 - single quotes for string values without interpolation
#6245 - adding coverage and group annotations
Merge branch 'hotfix/#6245-invalid-date-step-error-with-dst'

Close #6245