config.go:
Fixed some issues related to the url scheme not being lowercased which broke some of the tests.
config_test.go:
Removed the UNC share test for \\host\share\file since SMB support has been moved to a different uri scheme.
download_test.go:
Explicitly set the CopyFile configuration option for all the unit-tests that test file copying capability.
Removed the UNC share testcase since it's under a different uri scheme now.
Modified the file:// UNC share testcase to explicitly test the smb:// uri.
Changed the incorrect t.Errorf calls to t.Logf so that the tests can pass.