Use solution dir as base path for packages

Author: thomaslevesque

Git.hub/Git.hub.csproj

@@ -35,7 +35,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="RestSharp, Version=105.2.3.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\RestSharp.105.2.3\lib\net4-client\RestSharp.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\RestSharp.105.2.3\lib\net4-client\RestSharp.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />