Change the way to convert non-string value to string

This version is incompatible with old versions. In old versions, non-string values are serialized by JSON.stringify, but this version changes it to use .toString() first.

v2.0.1

• Fix including parameters without values (#13)

v2.0.0

Use a new way to support all platforms, and fix the issue on the browsers which have partial support only.

• Add proxy when browser doesn't support object constructor
• Fix partial support of browsers

v1.3.0

• Enable polyfill when browser doesn't support construct with an object

v1.2.0

• Add sort method