Matched VS2010 indentation behavior (two spaces)

src/actions/vstudio/vs2010_vcxproj.lua

@@ -620,6 +620,7 @@
 --
 
 	function premake.vs2010_vcxproj(prj)
+		io.indent = "  "
 		vc2010.header("Build")
 
 			vs2010_config(prj)
@@ -670,6 +671,7 @@
 	end
 
 	function premake.vs2010_vcxproj_user(prj)
+		io.indent = "  "
 		vc2010.header()
 		for _, cfginfo in ipairs(prj.solution.vstudio_configs) do
 			local cfg = premake.getconfig(prj, cfginfo.src_buildcfg, cfginfo.src_platform)

src/actions/vstudio/vs2010_vcxproj_filters.lua

@@ -107,6 +107,8 @@
 --
 	
 	function vc2010.generate_filters(prj)
+		io.indent = "  "
+		
 		cfg = premake.getconfig(prj)
 		local sorted = vc2010.sort_input_files(cfg.files)