Update mysqltuner.pl

FAIL Execute SQL / return code: 256 major#442
disable column type to ENUM suggestion major#356

Merge pull request major#439 from mpirio/fix/innodb_stats_on_metadata…

…VarNotExists

$myvar{'innodb_stats_on_metadata'} may not exist

Merge pull request major#409 from tcraxs/patch-1

fix defect link to mysql documentation - major#408

Incorrect suggestion for ratio InnoDB log file size / InnoDB buffer p…

…ool size major#322

Removing warnings for SQL request

Merge pull request major#128 from ravage84/patch-2

Change anonymous account recommendation to plural

Travis test

Version 1.4.0

Version 1.3.0

Version bump to 1.2.0