#374 Made IProxyGenerator (+ IFakeCallProcessorProvider and IFakeCallProcessor) internal
Merge pull request #378 from ulrichb/InternalIProxyGenerator

Make IProxyGenerator (+ IFakeCallProcessorProvider and IFakeCallProcessor) internal
setting version to 1.26.0
Merge pull request #379 from blairconrad/set-version-to-1.26.0

set version to 1.26.0 for next release
#367 - adding exception type and stack trace to failed creation messsage
#367 - cleanup after committing main fix
- using FluentAssertions
- reformatting some tests
- other minor refactorings