Hide more things from the npm package

Fixes #726

.npmignore

@@ -1,6 +1,7 @@
 dist/
 grunt/
 node_modules
+pkg/
 release_notes/
 spec/
 src/
@@ -8,11 +9,16 @@ Gemfile
 Gemfile.lock
 Rakefile
 jasmine-core.gemspec
-.rspec
+.bundle/
-.travis.yml
-.jshintrc
 .gitignore
+.gitmodules
+.idea
+.jshintrc
+.rspec
+.sass-cache/
+.travis.yml
 *.sh
+*.py
 Gruntfile.js
 lib/jasmine-core.rb
 lib/jasmine-core/boot/