NuGetManager: include compatible references, not just exact matching ones
NuGetManager: include compatible references, not just exact matching ones

A package with a .Net 4.0 version does support .Net 4.5 as well.
This was breaking with Math.NET Numerics.

ChinaQuants/IfSharp,jskonhovd/IfSharp,mndrake/IfSharp,FilippoPolo/IfSharp,mndrake/IfSharp,luminescent/IfSharp,luminescent/IfSharp,cgravill/IfSharp,simra/IfSharp,ChinaQuants/IfSharp,fradav/IfSharp,BayardRock/IfSharp,BayardRock/IfSharp,fradav/IfSharp,fradav/IfSharp,jskonhovd/IfSharp,FilippoPolo/IfSharp,cgravill/IfSharp,simra/IfSharp,FilippoPolo/IfSharp,luminescent/IfSharp,npmurphy/IfSharp,simra/IfSharp,npmurphy/IfSharp,jskonhovd/IfSharp,cgravill/IfSharp,BayardRock/IfSharp,npmurphy/IfSharp,npmurphy/IfSharp,ChinaQuants/IfSharp,luminescent/IfSharp,fradav/IfSharp,simra/IfSharp,mndrake/IfSharp,cgravill/IfSharp,FilippoPolo/IfSharp,BayardRock/IfSharp,mndrake/IfSharp,jskonhovd/IfSharp,ChinaQuants/IfSharp