Utility plugin for Git-related support

Extracted from git-plugin to make it easier for other plugins to use and contribute new features.

• see Jenkins wiki for detailed feature descriptions
• use JIRA to report issues / feature requests

Contributing to the Plugin

Refer to contributing to the plugin for suggestions to speed the acceptance of your contributions to the git client plugin.

To Do

• Fix bugs
• Create infrastructure to detect files opened during a unit test and left open at exit from test
• Create submodule tests
• Improve code coverage in current tests
• Complete more of the JGit implementation