Updates gitignore

.gitignore

@@ -1,3 +1,22 @@
-# vim temporary files
-*.swp
-*.*~
+# Generated by http://gitignore.io
+
+### OSX ###
+.DS_Store
+.AppleDouble
+.LSOverride
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear on external disk
+.Spotlight-V100
+.Trashes
+
+### vim ###
+.*.s[a-w][a-z]
+*.un~
+Session.vim
+.netrwhist
+*~