Merge pull request #781 from filipw/feature/allowunsafe-script

allow unsafe in C# scripts

src/OmniSharp.Script/ScriptProjectSystem.cs

@@ -42,6 +42,7 @@ public class ScriptProjectSystem : IProjectSystem
         private static readonly CSharpCompilationOptions CompilationOptions = new CSharpCompilationOptions(
                 OutputKind.DynamicallyLinkedLibrary,
                 usings: DefaultNamespaces,
+                allowUnsafe: true,
                 metadataReferenceResolver: ScriptMetadataResolver.Default, 
                 sourceReferenceResolver: ScriptSourceResolver.Default, 
                 assemblyIdentityComparer: DesktopAssemblyIdentityComparer.Default);