Grand Rounds simple forking wrapper around the qpdf executable.

We wrote it ourselves because there was no simple Ruby wrapper for qpdf. It is roughly copied from the pdftk gem, which is not actively maintained as of this writing.

Releases happen in CircleCI when a tag is pushed to the repository.

To create a release, you will need to do the following:

1. Change the version in qpdf.gemspec to the new version and create a PR with the change.
2. Once the PR is merged, switch to the master branch and git pull.
3. git tag <version from version.rb>
4. git push origin --tags

CircleCI will see the tag push, build, and release a new version of the library.