Provide helpful error message if strong name key is missing (fixes #41)
Prepare for development of release 1.1
Merge pull request #44 from sharwell/dev-1.1

Prepare for development of release 1.1
Use separate strong name keys for each target framework (fixes #27)
Merge pull request #43 from sharwell/fix-41

Provide helpful error message if strong name key is missing
Merge pull request #40 from sharwell/fix-27

Use separate strong name keys for each target framework
Validate strong name keys prior to creating NuGet packages (fixes #42)
Use WriteErrorLine instead of Echo
Merge pull request #45 from sharwell/writeerrorline

Use WriteErrorLine instead of Echo
Merge pull request #46 from sharwell/fix-42

Validate strong name keys prior to creating NuGet packages