adds capability to deserialize objects

[0x4139]

hey, i saw that the project isn't active for more than 2 years, thought that i should contribute since there isn't any solution to deserialize php objects at this moment

[hardchor]

@0x4139 Since, this is just pulled out of phpjs, I've submitted a PR there rather than here. See https://github.com/kvz/phpjs/pull/183 for custom and standard object support.