* Mono.Documentation/monodocer.cs: Use a single IAssemblyResolver

	* Mono.Documentation/monodocer.cs: Use a single IAssemblyResolver
	  shared amongst all AssemblyDefinitions to resolve assembly/type
	  references with Cecil.  Otherwise, if we have deeply nested
	  directories with cross-directory assembly dependencies, then Cecil
	  won't find the necessary assemblies (e.g. b/bin/Debug/b.dll has a
	  type which inherits from a/bin/Debug/a.dll -- here, we'll have two
	  separate AssemblyDefinitions, and when b.dll's AssemblyDefinition
	  tries to resolve types from a.dll, it fails).
	  See: http://lists.ximian.com/pipermail/mono-devel-list/2009-April/031646.html

svn path=/trunk/mcs/; revision=131370