Add blankCallback for ping, unsubsribe and punsubcribe methods.#19

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xzander wants to merge 2 commits intonrk:masterfrom xzander:master

+12-3

Commits on Dec 10, 2015

Add blankCallback for ping, unsubsribe and punsubcribe methods.
xzander
committed

Commits on Jul 7, 2016

Merge remote-tracking branch 'upstream/master'
xzander
committed