Better error handling during uninstallation.

[excitoon]

If one uninstalls more than one application and have an error, she will receive pretty random behaviour - scoop will either stops (skipping other applications) or continue to uninstall the current. This is so because continue doesn't works with pipes and some continue were supposed to exit current iteration of nested loop. When one calls continue from For-Each, PowerShell simply exits For-Each (the same effect as if it was break:

PS C:\Users\Chebotarev_V\scoop\apps\scoop\current> @(1,2,3,4) | % { echo $_; continue }
1
PS C:\Users\Chebotarev_V\scoop\apps\scoop\current> foreach($_ in @(1,2,3,4)) { echo $_; continue; }
1
2
3
4

[excitoon]

@rrelmy Done.

[rasa]

LGTM (but untested)