Add support for passing collapse-id to APNS

[Amnell]

Added support for adding apns-collapse-id to enable collapsing of pushes just like the apns-expiration.

I changed the method signature for APNS_generateNotification from APNS._generateNotification(data, expirationDate) to APNS._generateNotification(data, headers) making it easier to add more header properties in the future.

headers

The headers parameter is a JS object with the following supported properties:

• expirationTime
• collapseID
• topic

Don't hesitate to feedback on the code as JS isn't my "native" language :)

[codecov[bot]]

Codecov Report

Merging #79 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #79   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         249    252    +3     
=====================================
+ Hits          249    252    +3

Impacted Files	Coverage Δ
src/APNS.js	100% <100%> (ø)	:arrow_up:

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[flovilmart]

Thanks for the PR. Can you provide links to the docs from the APN lib as well as apple's so I can doublecheck if it's implemented as expected?

[Amnell]

@flovilmart

• Apple Documentation (Table 8-2)
• APN lib documentation
• APN source reference

[flovilmart]

Thanks for the docs! Very helpful :) Just one small nit.

[flovilmart]

Looking great! thanks!