fix zh translation
Added information about using bind in ECMAScript 5.
Type casting of Number object to primitive number has nothing to do with Number.toString()
Merge pull request #252 from jasonbellamy/master

Added information about using bind in ECMAScript 5.
Polski język, trudny język
Merge pull request #251 from tq5124/patch-1

fix zh translation
Merge pull request #256 from ferdynand/dupa

Polski język, trudny język
Merge pull request #255 from rmdm/type-casting-number-object-to-primitive

Type casting of Number object to primitive number has nothing to do with Number.toString()