Insert project extensions first

Ensure the project and solution extensions are inserted before
any other extension. This can be done by ensuring they are inserted
before 'InitialStep'.

Fixes #6

Author: mrward

src/MonoDevelop.ProjectSystem.Tools/Properties/MonoDevelop.ProjectSystem.Tools.addin.xml

@@ -6,8 +6,8 @@
 	</Runtime>
 
 	<Extension path="/MonoDevelop/ProjectModel/ProjectModelExtensions">
-		<Class class="MonoDevelop.ProjectSystem.Tools.BuildLoggingProjectExtension" />
-		<Class class="MonoDevelop.ProjectSystem.Tools.BuildLoggingSolutionExtension" />
+		<Class class="MonoDevelop.ProjectSystem.Tools.BuildLoggingProjectExtension" insertbefore="InitialStep" />
+		<Class class="MonoDevelop.ProjectSystem.Tools.BuildLoggingSolutionExtension" insertbefore="InitialStep" />
 	</Extension>
 
 	<Extension path="/MonoDevelop/Ide/Commands">