Add batch mode

As a developer I want to run Patchbot against a saved list of repositories in order to avoid copy & pasting a Git URL list and Patchbot commands.

Acceptance criteria

• Run one Patchbot command once to apply a patch to many repositories

Example:

Run

./vendor/bin/patchbot patch <batch-mode option>

instead of

./vendor/bin/patchbot patch --patch-name=template --repository-url=https://git.example.com/repository1
./vendor/bin/patchbot patch --patch-name=template --repository-url=https://git.example.com/repository2
./vendor/bin/patchbot patch --patch-name=template --repository-url=https://git.example.com/repository3
…
./vendor/bin/patchbot patch --patch-name=template --repository-url=https://git.example.com/repository53