Functionality to initialize the MetricsService dynamically on load; Better control over when those elements are sought after for compilation

Fixes to Signout and Keychain handling of missing credentials

Isolate time sensitive tests

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