Update csproj files to ToolsVersion="14"

Former-commit-id: ad5488593d0d4e541e89acfc553dc11317935ace
Former-commit-id: e3e7b109a4dca6e7825adf8372ca8745f79bd57c
Former-commit-id: 9720de62b1e708e084f1fe23f79bc337e261949e

src/ImageProcessor/ImageProcessor.csproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <MinimumVisualStudioVersion>14.0</MinimumVisualStudioVersion>

tests/ImageProcessor.Tests/ImageProcessor.Tests.csproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\packages\xunit.runner.visualstudio.2.0.0\build\net20\xunit.runner.visualstudio.props" Condition="Exists('..\..\packages\xunit.runner.visualstudio.2.0.0\build\net20\xunit.runner.visualstudio.props')" />
   <Import Project="..\..\packages\xunit.core.2.0.0\build\portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS\xunit.core.props" Condition="Exists('..\..\packages\xunit.core.2.0.0\build\portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS\xunit.core.props')" />
   <PropertyGroup>