fix gd reference for php 5.5
fix standard ref for php 5.5 (array_column)
fix data ref for php 5.5 (DateTimeInterface)
fix curl ref for php 5.4.15 (CURL_WRAPPERS_ENABLE)
 fix curl ref for php 5.4.15 (CURL_WRAPPERS_ENABLED)
Merge pull request #86 from remicollet/php-5.5

Php 5.5