handle trailing slashes in HttpUrlBuilder

[johnrengelman]

This change is 

[codecov-io]

Codecov Report

Merging #1444 into master will increase coverage by 0.01%.
The diff coverage is 75%.

@@             Coverage Diff              @@
##             master    #1444      +/-   ##
============================================
+ Coverage     73.74%   73.75%   +0.01%     
- Complexity     4529     4533       +4     
============================================
  Files           649      649              
  Lines         16993    16995       +2     
  Branches       1424     1424              
============================================
+ Hits          12531    12535       +4     
+ Misses         3844     3840       -4     
- Partials        618      620       +2

Impacted Files	Coverage Δ	Complexity Δ
...a/ratpack/http/internal/DefaultHttpUrlBuilder.java	87.39% <75%> (-0.64%)	38 <3> (+2)
.../http/client/internal/IdlingConnectionHandler.java	66.66% <0%> (-33.34%)	2% <0%> (-1%)
...ratpack/exec/internal/ExecutionBoundPublisher.java	86.44% <0%> (-1.7%)	3% <0%> (ø)
...a/ratpack/stream/internal/SubscriptionSupport.java	76.62% <0%> (+1.29%)	20% <0%> (+1%)	⬆️
...va/ratpack/spring/config/RatpackConfiguration.java	70.96% <0%> (+6.45%)	3% <0%> (+1%)	⬆️
...a/ratpack/stream/internal/ForkingSubscription.java	72.41% <0%> (+10.34%)	4% <0%> (+1%)	⬆️

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