aggressive cleanup of gem artifacts not needed at run time. 300 to 40…

…0% reduction in size

Makefile

@@ -2,6 +2,11 @@
 bundle:
 	/usr/bin/bundle install --without test --path vendor/bundle --binstubs bin/ --deployment
 	(cd vendor/bundle/ruby/ && find . -type f -exec grep -l '/usr/bin/ruby' {} \; | xargs sed -i -e 's|/usr/bin/ruby|/usr/bin/ruby|') || true
+	# clean up things that are not needed at run time
+	(cd vendor/bundle/ruby/ && rm -rf cache) || true
+	(cd vendor/bundle/ruby/gems && rm -rf rails-*/guides */spec */doc */doc-api) || true
+	(cd vendor/bundle/ruby/gems && rm -rf */test */tests) || true
+	(cd vendor/bundle/ruby/ && find . \( -name '*.[coa]' -or -name '*.cc' -or -name '*.md' -or -name '.git' \) -exec rm -rf {} \;) || true
 
 distclean: clean
 	rm -rf vendor/bundle