Build Fails when run twice - Can't run task Clean

[gaelcolas]

The task Clean fails when the Pester Module is loaded somewhere, because of the gherkin.dll is in use. That means if you run a first time it works, the second it fails.

Workarounds I can think of:

• Clean the $BuildOutput folder excludin the modules subfolder (not nice as if Dependency.psd1 is missing a pre-installed entry it won't be picked up). Not 100% Clean.
• Catch the Exception and display warning instead, but carry on on failed Clean. Not 100% Clean.
• Start new PowerShell process, kill current session. In the new Process add a delay (i.e. 1sec), pushd then Invoke-Build. 100% Clean but that means terminal hopping... nasty...

[gaelcolas]

Currently Implemented the $BuildOutput\modules exclusion.