Update payload limit to 2KB.#23

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ToroLiu wants to merge 5 commits intoRamosLi:masterfrom

Commits on Jan 19, 2017

Commits on Sep 14, 2017

Support `title` for payload.
ToroLiu
authored

Commits on Apr 18, 2018

support `mutable-content` property.
Aecho
committed

Commits on May 31, 2018

Add callback object
Aecho
committed