Use GraphQL to read PR reviews/comments.

This is integrated a bit hackily into `ModelService`; `ModelService` doesn't really mesh well with GraphQL but without a lot of refactoring this was the best way to get things up and running.

Author: grokys

src/GitHub.App/Models/Account.cs

@@ -88,7 +88,7 @@ public BitmapSource Avatar
             set { avatar = value; this.RaisePropertyChanged(); }
         }
 
-#region Equality things
+        #region Equality things
         public void CopyFrom(IAccount other)
         {
             if (!Equals(other))

src/GitHub.App/packages.config

@@ -20,7 +20,8 @@
   <package id="Microsoft.VisualStudio.TextManager.Interop" version="7.10.6071" targetFramework="net461" />
   <package id="Microsoft.VisualStudio.TextManager.Interop.8.0" version="8.0.50728" targetFramework="net461" />
   <package id="Microsoft.VisualStudio.Utilities" version="14.3.25407" targetFramework="net461" />
-  <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net461" />
+  <package id="Octokit.GraphQL" version="0.0.1" targetFramework="net461" />
   <package id="Rothko" version="0.0.3-ghfvs" targetFramework="net461" />
   <package id="Rx-Core" version="2.2.5-custom" targetFramework="net45" />
   <package id="Rx-Interfaces" version="2.2.5-custom" targetFramework="net45" />