I've been trying to get MSBuild to work but i got stuck. I'm using Matt's tutorial. This is the code i have now:

<?xml version="1.0" encoding="utf-8" ?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Package">

  <!-- 
    ****************************************
      * PROPERTIES
  ****************************************
  -->
  <PropertyGroup>
   <PackageVersion>1.0</PackageVersion>
  </PropertyGroup>

  <PropertyGroup>
 <RootDir>$(MSBuildProjectDirectory)</RootDir>
 <BuildDir>$(RootDir)\TempBuild</BuildDir>
 <PackageDir>$(RootDir)\Package</PackageDir>
  </PropertyGroup>
  
  <!-- 
     ****************************************
      * TARGETS
 ****************************************
  -->
  
  <!-- CLEAN -->
  <Target Name="Clean">
 <RemoveDir Directories="$(BuildDir)" Condition="Exists('$(BuildDir)')" />
   <RemoveDir Directories="$(PackageDir)" Condition="Exists('$(PackageDir)')" />
   <MakeDir Directories="$(BuildDir)" />
   <MakeDir Directories="$(PackageDir)" />
  </Target>
    
  <!-- PREPAIRE FILES --> 
  <Target Name="PrepairFiles" DependsOnTargets="Clean">
    <ItemGroup>
        <PackageFile Include="$(RootDir)\Package.xml" />
    </ItemGroup>
    <Copy SourceFiles="@(PackageFile)" DestinationFolder="$(BuildDir)" />
  </Target> 
  
  <!-- MANIFEST -->
  <Target Name="Manifest" DependsOnTargets="PrepairFiles">
  <ItemGroup>
      <ManifestFiles Include="$(BuildDir)\**\*" Exclude="$(BuildDir)\Package.xml" />
    </ItemGroup>
 <ReadLinesFromFile File="$(RootDir)\Readme.txt"> 
       <Output TaskParameter="Lines" ItemName="Readme" /> 
 </ReadLinesFromFile>
    <ManifestUpdate ManifestFile="$(BuildDir)\Package.xml"
     WorkingDirectory="$(BuildDir)"
        PackageVersion="$(PackageVersion)"
        Readme="@(Readme->'%(Identity)', '%0a%0d')"
        Files="@(ManifestFiles)" />
  </Target> 
    
  <!-- PACKAGE -->
  <Target Name="Package" DependsOnTargets="Manifest">
   <ItemGroup>
      <PackageFiles Include="$(BuildDir)\**\*.*" />
      </ItemGroup>
    <Package ManifestFile="$(BuildDir)\Package.xml"
       WorkingDirectory="$(BuildDir)"
       OutputDirectory="$(PackageDir)"
    Files="@(PackageFiles)" /> 
  </Target> 
  
</Project>

And when i run it i get this error message:

D:\Projekt\html5-boilerplate-for-umbraco\Package.build.xml(49,2): error MSB4036
: The "ManifestUpdate" task was not found. Check the following: 1.) The name of
 the task in the project file is the same as the name of the task class. 2.) Th
e task class is "public" and implements the Microsoft.Build.Framework.ITask int
erface. 3.) The task is correctly declared with <UsingTask> in the project file
, or in the *.tasks files located in the "C:\Windows\Microsoft.NET\Framework\v2
.0.50727" directory.
Done Building Project "D:\Projekt\html5-boilerplate-for-umbraco\Package.build.x
ml" (default targets) -- FAILED.

I don't really know what I'm doing here. You're free to call me an idiot. You can find the whole project here.