Remove pry from gemspec for JRuby compatibility

pry-debugger doesn't compile on JRuby, and we're really only using that
locally.
Version 3.5.2
Print all the files!
WIP
Appraisal is not compatible with the platform block syntax used in the Gemfile
Added 3.2.15 Rails to run test.
Really exclude 1.9.2 and Rails 4 from build matrix
removes duplication
Close all the files! Well, some anyway.
Don't commit commented code.
Merged close-all-the-files
Merge pull request #1376 from gmarik/patch-1

removes duplication
Merge pull request #1374 from thoughtbot/aa-rails-3-2-15-update

Added 3.2.15 Rails to run test.
Prevent file deletion on transaction rollback
Update README.md

Added changes to instructions to work with Rails 4's strong parameters.
Clarify Rails 3/4 things in the README
Deep merge Attachment options into default_options
failing spec for attachment definitions
traverse ancestors to find definitions
Refactoring of previous commit