Reflection cache clear support

[alistairjevans]

Raising a PR that fixes #1324.

@mburnell, I'm partly raising this so we can get a MyGet build out; you can pull that down and see if that helps with your situation before we fully push a fix out.

[codecov[bot]]

Codecov Report

Merging #1326 (348acb1) into develop (56af5b3) will increase coverage by 0.13%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1326      +/-   ##
===========================================
+ Coverage    77.69%   77.83%   +0.13%     
===========================================
  Files          190      193       +3     
  Lines         5412     5446      +34     
  Branches      1084     1092       +8     
===========================================
+ Hits          4205     4239      +34     
  Misses         705      705              
  Partials       502      502              

Impacted Files	Coverage Δ
...ctivators/Reflection/AutowiringPropertyInjector.cs	100.00% <100.00%> (ø)
...ac/Core/Activators/Reflection/ConstructorBinder.cs	91.80% <100.00%> (ø)
.../Activators/Reflection/DefaultConstructorFinder.cs	100.00% <100.00%> (ø)
src/Autofac/Util/ReflectionCache.cs	100.00% <100.00%> (ø)
src/Autofac/Util/ReflectionCacheDictionary.cs	100.00% <100.00%> (ø)
src/Autofac/Util/ReflectionCacheTupleDictionary.cs	100.00% <100.00%> (ø)
src/Autofac/Util/TypeExtensions.cs	96.15% <100.00%> (ø)

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[alistairjevans]

Closing in favour of a new approach on the same branch.