Use new env variable for target framework.
If there's no current service provider don't throw when getting it
- Code more defensively to handle nulls using C# 6 hotness
Back to normal C#
- IL created by C# 6 is null propagation seems to explode in release mode
Add "--quiet" to "kpm install"
Add environment variable KRE_APPBASE to set application base
"kpm pack" identifies source files outside of project root and packs them

- Changed PathUtility.IsSubDirectory() to IsChildOfDirectory()
- Added unit tests for PathUtility.IsChildOfDirectory()