Remove dead references to JetBrains.Annotations

After converting from packages.config to project.json.

Author: angularsen

UnitsNet/UnitsNet.Net35.csproj

@@ -32,10 +32,6 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="JetBrains.Annotations, Version=10.0.0.0, Culture=neutral, PublicKeyToken=1010a0d8d6380325, processorArchitecture=MSIL">
-      <HintPath>..\packages\JetBrains.Annotations.10.0.0\lib\net20\JetBrains.Annotations.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />

UnitsNet/UnitsNet.Portable40.csproj

@@ -44,10 +44,6 @@
     <None Include="Scripts\**\*.*" />
   </ItemGroup>
   <ItemGroup>
-    <Reference Include="JetBrains.Annotations.PCL328, Version=10.0.0.0, Culture=neutral, PublicKeyToken=1010a0d8d6380325, processorArchitecture=MSIL">
-      <HintPath>..\packages\JetBrains.Annotations.10.0.0\lib\portable-net4+sl5+netcore45+wpa81+wp8+MonoAndroid1+MonoTouch1\JetBrains.Annotations.PCL328.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.

UnitsNet/UnitsNet.WindowsRuntimeComponent-Net45.csproj

@@ -45,10 +45,6 @@ There is probably a better way to achieve this?
     <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="JetBrains.Annotations, Version=10.0.0.0, Culture=neutral, PublicKeyToken=1010a0d8d6380325, processorArchitecture=MSIL">
-      <HintPath>..\packages\JetBrains.Annotations.10.0.0\lib\net20\JetBrains.Annotations.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />