Factory 2.1.3 Released

[hmlongco]

• Fix singleton scope issue with SharedContainer across multiple container types. Issue - # 92
• Fix unit test context to detect when run from command line. Issue - # 94
• Fix where new registration on Factory also clears singleton cache. Issue - # 96
• Minor update to trace logging for better presentation of nil optionals

Most of this release is dedicated to oddities with singletons. See the Testing Singletons section in Testing for more.