Return error via SubscriptionListener when presence events are malformed

[jonathanlloyd]

This PR resolves: #286

[codecov-io]

Codecov Report

Merging #290 (8816840) into master (93c25bc) will decrease coverage by 0.04%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #290      +/-   ##
============================================
- Coverage     76.08%   76.03%   -0.05%     
- Complexity      284      285       +1     
============================================
  Files            31       32       +1     
  Lines          1802     1807       +5     
  Branches        137      139       +2     
============================================
+ Hits           1371     1374       +3     
- Misses          375      376       +1     
- Partials         56       57       +1     

Impacted Files	Coverage Δ	Complexity Δ
...sher/client/channel/SubscriptionEventListener.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...usher/client/channel/impl/PresenceChannelImpl.java	78.20% <80.00%> (-0.18%)	20.00 <3.00> (+1.00)	⬇️

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