Update all dependencies

* dotless is replaced by DotlessClientOnly because all the ASP.NET specific is not needed
* Minifier changes -> minimal changes that should not have any impact and can be reversed if needed: https://ajaxmin.codeplex.com/discussions/575808
* YamlDotNet.Core & YamlDotNet.RepresentationModel are obsolete and have been replaced by YamlDotNet
* set new property dotless.Core.Input.IFileReader.UseCacheDependencies to true in order to preserve the behavior, but I don't think it is really needed:
https://github.com/dotless/dotless/commit/d77100d29ec0f00556e6f4361d52f68ca790f77e?diff=split#diff-28abd8bf56c31b2b787237fbacab2e48R8