Propagate F# bugs in grain code

[davidpodhola]

I know that #38 discusses F# support and that it is a complex issue.
Just that few days ago I was writing grains in F# and found out that currently the result of running the fsharp compiler during code generation is hidden. In that case (if I am not mistaken), the only output you get is something like

Error : Orleans code generator found error : -- Code-gen FAILED -- [C:\temp\exchange2crm\src\exchange2crm.Grains\exchange2crm.Grains.fsproj]

I think the easiest would be to simply allow the result to be show.