PostInstallHook Install.ps1 is now configurable, per command defineable, there is a PostUpdateHook and a switch to suppress PostInstallHooks
added tests for post-install-hook feature
- TabExpansion++ contains an Install.ps1 which should not be executed
- posh-git contains an Install.ps1 which should be not executed for updates
fixed unzip for Windows Server core environment if using powershell v3+ with .net 4.5 (.net implementation is default if available)
Merge pull request #136 from flofreud/post-install-hook

Post install hook
Merge pull request #140 from flofreud/fix-zip-on-windows-core

fixed #139:  unzip for Windows Server Core environment
fix test module definitions
issue #142 fixed