added documentation about php.ini variables, and fixed typo in exception documentation
small fix to php.ini documentation
Fix relative url in ten-reasons-for-using-php-cpp
Merge pull request #89 from wapmorgan/fix_doc

Fix docs

Thanks for contributing.
Value objects constructed with (const char *)NULL caused a crash, this has been fixed so they hold a PHP NULL value
When "apache reload" is called, the PHP-CPP library made the entire Apache process crash. This has been fixed
Merge branch 'master' of https://github.com/CopernicaMarketingSoftware/PHP-CPP
update documentation about extension callbacks
tiny changes in documentation about extension callbacks