Fix display of custom console command

[Jomaanro]

Whe executing the ./yii command it will scan the custom console Controllers and display the name to execute this command. If you have a controller which is camelCased the name will be incorrent.

For example:

TestCustomController.php will be displayed as testCustom. This is actually not working and should be test-custom

The preg_replace will put a - (minus sign) before every capital letter except the first one and lowers the complete string. Now the output will be correct.

[coveralls]

Coverage decreased (-0%) when pulling 3249901 on Jomaanro:master into af6f6d1 on yiisoft:master.

[coveralls]

Coverage remained the same when pulling 12862c3 on Jomaanro:master into 62dee14 on yiisoft:master.

[qiangxue]

Thanks. Used Inflector instead.