Fix relate bug

[halfabrane]

Previously Polygon#intersects(Line) used to be a strict intersection check With 62910c30, this behavior changed. This breaks BoundingBox#relate which now always returns Intersects even when it should return Within, creating a performance regression

This PR adds tests to BoundingBox#relate which if they existed would have caught the issue It also introduces a strict intersection check it is based off a PR from @zebehringer who first noticed this regression (thanks Zack!)

@zebehringer for review

[codecov-io]

Codecov Report

Merging #207 into master will increase coverage by 0.16%. The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
+ Coverage      90%   90.16%   +0.16%     
==========================================
  Files          52       52              
  Lines        1790     1789       -1     
  Branches      129      124       -5     
==========================================
+ Hits         1611     1613       +2     
+ Misses        179      176       -3

Impacted Files	Coverage Δ
src/main/scala/magellan/BoundingBox.scala	95.65% <100%> (+2.17%)	:arrow_up:
src/main/scala/magellan/Polygon.scala	87.58% <100%> (-0.17%)	:arrow_down:
src/main/scala/magellan/PolyLine.scala	89.47% <100%> (ø)	:arrow_up:
src/main/scala/magellan/Shape.scala	58.53% <80%> (+6.03%)	:arrow_up:
src/main/scala/magellan/catalyst/SpatialJoin.scala	95.23% <0%> (-2.39%)	:arrow_down:
...in/scala/org/apache/spark/sql/types/PointUDT.scala	100% <0%> (+3.12%)	:arrow_up:

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[harsha2010]

Thanks @zebehringer