Support Swift 3.1 (SwiftMetricsDash not currently working)

[sjanuary]

Needed to pull in agentcore code to be able to build on Swift 3.1 as code can no longer be executed in Package.swift. We also have a new Package@swift-3.1.swift to enable different levels of the dependencies for 3.1 and some code changes required because the install directory has changed from Packages to .build/checkouts between 3.0 and 3.1. SwiftMetricsDash does not currently work on Swift 3.1 due to a WebSockets issue (Kitura/Kitura-WebSocket#5).

[codecov-io]

Codecov Report

Merging #96 into master will increase coverage by 0.52%.
The diff coverage is 1.55%.

@@            Coverage Diff            @@
##           master     #96      +/-   ##
=========================================
+ Coverage       0%   0.52%   +0.52%     
=========================================
  Files           5      82      +77     
  Lines         818    8207    +7389     
=========================================
+ Hits            0      43      +43     
- Misses        818    8164    +7346

Flag	Coverage Δ
#SwiftMetrics	0% <0%> (ø)	⬆️
#SwiftMetricsBluemix	0% <0%> (ø)	⬆️
#SwiftMetricsDash	0% <0%> (ø)	⬆️
#SwiftMetricsKitura	0% <0%> (ø)	⬆️
#agentcore	1.51% <2.12%> (?)
#cpuplugin	1.43% <1.95%> (?)
#envplugin	1.35% <1.81%> (?)
#hcapiplugin	1.32% <1.76%> (?)
#memplugin	1.27% <1.66%> (?)
#mqttplugin	1.2% <1.55%> (?)
#ostreamplugin	1.2% <1.55%> (?)
#paho	0.52% <1.55%> (?)

Impacted Files	Coverage Δ
Sources/paho/include/MQTTAsync.h	0% <ø> (ø)
Sources/paho/src/MQTTPersistence.c	0% <ø> (ø)
Sources/paho/include/MQTTPersistence.h	0% <ø> (ø)
Sources/paho/src/Clients.c	0% <ø> (ø)
Sources/paho/src/MQTTProtocolClient.c	0% <ø> (ø)
Sources/paho/src/utf-8.c	0% <ø> (ø)
Sources/paho/src/Tree.c	0% <ø> (ø)
Sources/paho/include/Thread.h	0% <ø> (ø)
Sources/paho/src/Heap.c	0% <ø> (ø)
Sources/paho/include/SocketBuffer.h	0% <ø> (ø)
... and 146 more

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[mattcolegate]

All looks good to me