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been replaced by YamlDotNet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
Merge pull request #183 from laedit/UpdateDependencies

Update all dependencies