Added a few ignore files and made sure release mode includes the same .NET flags as debug mode

Author: borrrden

.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

System.Threading.Tasks.Net35.csproj

@@ -22,13 +22,13 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>full</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <DefineConstants>NET_4_0;NET_4_5;</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />