Enable pagination convention tests (#1659)

* Unskip pagination convention tests and rework exclusion property names
Also exclude Obsolete methods from pagination convention tests

* Reaction APIs appear to support pagination, flag to exclude for now and mark a TODO that they need implementing

* Repository invitation APIs need pagination implemented

* Exclude methods that use an alternative pagination approach

* Migrations, Licenses and References all need pagination implemented

* Pagination not supported for these methods (determined by API doc and poking the API) so exclude them from convention tests

* These methods need renaming to GetAll

* Rename offending RepositoryTrafficClient GetReferrers and GetPaths to GetAllReferrers and GetAllPaths

* Rename offending RepositoryBranchesClient methods from Get to GetAll

Octokit.Tests.Conventions/Exception/ApiOptionsMissingException.cs

@@ -14,7 +14,7 @@ namespace Octokit.Tests.Conventions
         static string CreateMessage(Type type, IEnumerable<MethodInfo> methods)
         {
             var methodsFormatted = String.Join("\r\n", methods.Select(FormatMethod));
-            return "Methods found on type {0} require an overload which accepts an parameter of type ApiOptions:\r\n{1}"
+            return "Methods found on type {0} require an overload which accepts a parameter of type ApiOptions:\r\n{1}"
                       .FormatWithNewLine(
                           type.Name,
                           methodsFormatted);