fix(common): escape replaced value

[blastZ]

Something like this log('I like %O', { name: '%sugar%' }); will cause output incorrect.

[coveralls]

Coverage increased (+0.05%) to 87.739% when pulling d687542 on blastZ:patch-1 into 80ef62a on visionmedia:master.

[coveralls]

Coverage increased (+0.05%) to 87.739% when pulling d687542 on blastZ:patch-1 into 80ef62a on visionmedia:master.

[Qix-]

Can you add tests for this, please? I'm not sure which sorts of things this fixes.

[blastZ]

Can you add tests for this, please? I'm not sure which sorts of things this fixes.

The default formatters will replace %o and %O, so when arguments go to the log function, util.format will get arguments like this ["...'%sugar%'... }", '...']. So if you don't escape the % in the value, util.format will replace %s with the next argument. That's why issue #766 happend.