check and optimize for php 7.0 usage

[hpvd]

check and optimize for php 7.0 usage
Since PHP 7.0 is released and seems to achieve very good speed enhancements
see http://talks.php.net/froscon15#/magentobench
( use links at bottom for details )

and with this Magento 1.9.2.2 can be made easily compatible by using this extension
https://github.com/Inchoo/Inchoo_PHP7 [^]
which includes fixes for all known incompatibilities
see https://magento.stackexchange.com/questions/74008/is-magento-ready-for-php-7/

=> it would be great to check and ensure php 7 compatibility of this extension too.
To spread a word about the status of compatibility in documentation would make it perfect :-)