I noticed that some files in rubygems were executable, and I could think
of no reason why they should be.

In general, I think ruby files should never have the executable bit set
unless they include a shebang, so I run the following command over the
whole repo:

```bash
find . -name '*.rb' -type f -executable -exec bash -c 'grep -L "^#!" $1 || chmod -x $1' _ {} \;
```

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57538 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

g -L frozen_string_literal ext/**/*.rb|xargs ruby -Ka -e'ARGV.each{|fn|puts
fn;open(fn,"r+"){|f|s=f.read.sub(/\A(#!.*\n)?(#.*coding.*\n)?/,"\\&#
frozen_string_literal: false\n");f.rewind;f.write s}}'

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53143 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* ext/ripper/MANIFEST: new file.
* ext/ripper/README: new file.
* ext/ripper/depend: new file.
* ext/ripper/extconf.rb: new file.
* ext/ripper/eventids2.c: new file.
* ext/ripper/ripper.rb.in: new file.
* ext/ripper/lib/ripper.rb: new file.
* ext/ripper/test/check-event-arity.rb: new file.
* ext/ripper/test/check-event-coverage.sh: new file.
* ext/ripper/test/check-scanner-event-coverage.rb: new file.
* ext/ripper/test/list-called-events.rb: new file.
* ext/ripper/test/src_rb: new file.
* ext/ripper/test/validate.rb: new file.
* ext/ripper/tools/generate-eventids1.rb: new file.
* ext/ripper/tools/generate-param-macros.rb: new file.
* ext/ripper/tools/generate-ripper_rb.rb: new file.
* ext/ripper/tools/list-parse-event-ids.rb: new file.
* ext/ripper/tools/list-scan-event-ids.rb: new file.
* ext/ripper/tools/preproc.rb: new file.
* ext/ripper/tools/strip.rb: new file.
* test/ripper: ripper tests added.
* test/ripper/dummyparser.rb: new file.
* test/ripper/test_parser_events.rb: new file.
* test/ripper/test_scanner_events.rb: new file.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6891 b2dd03c8-39d4-4d8f-98ff-823fe69b080e