ignore more perl outputs

- metaspec v2.0 now creates json files
- some artifacts of XS builds

Author: karenetheridge

Perl.gitignore

@@ -11,6 +11,9 @@ Build.bat
 /Makefile.old
 /MANIFEST.bak
 /META.yml
-/MYMETA.yml
+/META.json
+/MYMETA.*
 nytprof.out
 /pm_to_blib
+*.o
+*.bs