tostring all errors in the error handler (issue #332)

src/scripts/boot.lua

@@ -667,10 +667,11 @@ end
 local debug = debug
 
 local function error_printer(msg, layer)
-	print((debug.traceback("Error: " .. msg, 1+(layer or 1)):gsub("\n[^\n]+$", "")))
+	print((debug.traceback("Error: " .. tostring(msg), 1+(layer or 1)):gsub("\n[^\n]+$", "")))
 end
 
 function love.errhand(msg)
+	msg = tostring(msg)
 
 	error_printer(msg, 2)
 

src/scripts/boot.lua.h

@@ -1642,12 +1642,15 @@ const unsigned char boot_lua[] =
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