docs: rectify the type in the comment.
refactor: rename projects

Experiment.AutoFixture -> Experiment.AutoFixture.NuGetFiles
Experiment.AutoFixtureUnitTest ->
Experiment.AutoFixture.NuGetFilesUnitTest
dev: address the code analysis warning.
build(nuspec): rectify paths of transform files,

and include Experiment.dll but do not depend on Experiment nuget
package.
build(DEPLOYMENT): increment pre-release version,

to test publishing nuget packages.
build: delete Experiment.nuspec.
Merge branch 'change-nuget-content'
build(DEPLOYMENT): increment patch version,

to indicate that including experiment.dll to Experiment.AutoFixture is
a fix rather than a breaking-change.