Refresh HistoryView after repository initialize

Fixing crash during git init

Trying to load keychain; trying to handle scenario where item is in the cache but not in the credentialManager

Rename Initialize(IView) to InitializeView; Change Subview.Initialize(IApplicationManager) to be virtual; Calling UpdateLog on HistoryView.Initialize(IApplicationManager)

Updating Git-Lfs to v2.1.1

# Conflicts:
#	src/IntegrationTests/Git/GitSetupTests.cs
#	src/tests/IntegrationTests/IntegrationTests.csproj

 Improving Build times; Changing Build to AppVeyor.yml

New task system based on schedulers