Revert "signed assembly with Strong Name key (issue #52)."

This reverts commit bb6f9097ee.

S7.Net/S7.Net.csproj

@@ -53,12 +53,6 @@
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
-  <PropertyGroup>
-    <SignAssembly>true</SignAssembly>
-  </PropertyGroup>
-  <PropertyGroup>
-    <AssemblyOriginatorKeyFile>S7.Net.snk</AssemblyOriginatorKeyFile>
-  </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Core">
@@ -94,9 +88,6 @@
       <Install>true</Install>
     </BootstrapperPackage>
   </ItemGroup>
-  <ItemGroup>
-    <None Include="S7.Net.snk" />
-  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.