Change download strategy to use artifact rule destination path as the
local download path.
Adding log messages.
Remove OutputPath parameter from the GetDependenciesOptions.

The download location is now retrieved from the artifact rules.
Change GetDepencencyOptions to use an 'init' option instead of
Force + BuildConfigId.

Init will define that the config file needs to be created.
Add nlog config settings to app.config.
Update ResolveDependencyCommand to find download paths relative to
the dependencies.config file.
Fix unit tests.