Swift 4 conversion

[KashishGoel]

No description provided.

[plivesey]

LGTM. Looks like we also need to update travis to new toolchain

[plivesey]

Sadly, I don't have merge permissions :(

[codecov-io]

Codecov Report

Merging #76 into master will decrease coverage by 1.32%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage    91.7%   90.37%   -1.33%     
==========================================
  Files          46       46              
  Lines        4784     5686     +902     
  Branches        0      166     +166     
==========================================
+ Hits         4387     5139     +752     
- Misses        397      540     +143     
- Partials        0        7       +7

Impacted Files	Coverage Δ
RocketDataTests/BatchListenerTests.swift	97.5% <0%> (-0.72%)	⬇️
RocketData/ParsingHelpers.swift	88.88% <0%> (-11.12%)	⬇️
...ncyManager/Protocols/ConsistencyManagerModel.swift	57.89% <0%> (-8.78%)	⬇️
...ConsistencyManager/DataStructures/Array+Weak.swift	72.41% <0%> (-7.59%)	⬇️
RocketData/ChangeTime.swift	95.23% <0%> (-4.77%)	⬇️
RocketDataTests/TestModels/ChildModel.swift	83.33% <0%> (-3.04%)	⬇️
RocketData/BatchDataProviderListener.swift	91.3% <0%> (-2.82%)	⬇️
...taProviderTests/ConsistencyDataProviderTests.swift	90.2% <0%> (-2.36%)	⬇️
RocketDataTests/ParsingHelpersTests.swift	77.27% <0%> (-2.1%)	⬇️
...Tests/ConsistencyCollectionDataProviderTests.swift	92.15% <0%> (-1.79%)	⬇️
... and 37 more

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[KashishGoel]

FYI we need this ticket taken care of: plivesey/ConsistencyManager#58

so we can update the pod in this repo and do the merge. Otherwise it'll cause issues.

[plivesey]

I've now been given merge permissions and will be the maintainer going forward.

I'm going to merge this now, run some more tests, and then release a new podspec.

Thanks for your help on this.