Updated props file to make packages pre-release. Made base version 4.0.0 because of breaking backward compatibility.

Author: jkoritzinsky

Build/SharpDX.props

@@ -15,8 +15,9 @@
     <Company>Alexandre Mutel</Company>
     <Copyright>Copyright (c) 2010-2016 Alexandre Mutel</Copyright>
     <NeutralLanguage>en-US</NeutralLanguage>
-    <Version>3.1.2</Version>
-    <AssemblyVersion>3.1.2</AssemblyVersion>
+    <Version>4.0.0</Version>
+    <AssemblyVersion>$(Version)</AssemblyVersion>
+    <Version Condition=" '$(SharpDXPackagingDev)' == 'true' ">$(Version)-ci$(SharpDXBuildNumber)</Version>
     <PackageOutputPath>$(SolutionDir)bin</PackageOutputPath>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' And Exists('$(SolutionDir)sharpdx.snk')">