ignore .packages file and .pub directory

and other cleanup to .gitignore
diff --git a/pkgs/markdown/.gitignore b/pkgs/markdown/.gitignore
index aeb4e13..aac1f4f 100644
--- a/pkgs/markdown/.gitignore
+++ b/pkgs/markdown/.gitignore
@@ -1,5 +1,4 @@
+.packages
+.pub
 packages
 pubspec.lock
-.project
-.children
-out
\ No newline at end of file