Update minimum PHP version to 5.3.3

The Symfony minimum version is PHP 5.3.3
Update concrete5 minimum to that
Merge pull request #22 from mkly/php_5_3_3

Update minimum PHP version to 5.3.3
adding tableExists function, making it case insensitive
Merge branch 'master' of github.com:concrete5/concrete5-5.7.0
Fixing mysql strict errors; adding timestamp support to legacy library
Fixes #23
Fixes #15
Fix environment info page, add composer.phar to gitignore
Merge pull request #31 from KorvinSzanto/master

Fix environment info page, add composer.phar to gitignore