cleanup; mono framework build

Author: Joshua Miller

.travis.yml

@@ -1,8 +1,9 @@
 language: csharp
-mono: none
+mono: 5.2.0
 dotnet: 2.0.0
 
 install:
+  - export FrameworkPathOverride=$(dirname $(which mono))/../lib/mono/4.5/
   - curl -L -o nuget.exe https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
   - dotnet restore
 

Jenkins.Net/IJenkinsClient.cs

@@ -1,6 +1,9 @@
 using JenkinsNET.Models;
+
+#if NET_ASYNC
 using System.Threading;
 using System.Threading.Tasks;
+#endif
 
 namespace JenkinsNET
 {

Jenkins.Net/Jenkins.NET.csproj

@@ -20,6 +20,7 @@
     <Version>1.0.3</Version>
     <FileVersion>1.0.3</FileVersion>
     <AssemblyVersion>1.0.3</AssemblyVersion>
+    <LangVersion>latest</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(TargetFramework)' == 'netstandard2.0'">
     <DefineConstants>NETCORE;NETSTANDARD;NETSTANDARD2_0;NET_ASYNC</DefineConstants>

Jenkins.Net/Jenkins.Net.csproj

@@ -2,8 +2,11 @@
 using JenkinsNET.Internal.Commands;
 using JenkinsNET.Models;
 using System;
+
+#if NET_ASYNC
 using System.Threading;
 using System.Threading.Tasks;
+#endif
 
 namespace JenkinsNET
 {