Increasing test coverage on Collection types.

[tonystone]

• Added coverage for all collection classes.
• Fixed all issues uncovered by the new tests.

[tonystone]

Current coverage is 92.53% (diff: 96.84%)

Merging #115 into master will increase coverage by 15.84%

@@             master       #115   diff @@
==========================================
  Files            39         39          
  Lines          2226       2249    +23   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits           1707       2081   +374   
+ Misses          519        168   -351   
  Partials          0          0          

Diff Coverage	File Path
0%	Sources/GeoFeatures/LinearRing+Geometry.swift
0%	Sources/GeoFeatures/MultiPolygon+Geometry.swift
••• 33%	Sources/GeoFeatures/MultiPolygon+Surface.swift
••••• 50%	Sources/GeoFeatures/MultiLineString+Curve.swift
•••••••••• 100%	Sources/GeoFeatures/LineString+Geometry.swift
•••••••••• 100%	Sources/GeoFeatures/MultiPoint.swift
•••••••••• 100%	Sources/GeoFeatures/LineString.swift
•••••••••• 100%	Sources/GeoFeatures/MultiPolygon.swift
•••••••••• 100%	Sources/GeoFeatures/MultiLineString+Geometry.swift
•••••••••• 100%	Sources/GeoFeatures/MultiLineString.swift

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