Add a YAML configuration to resmokeconfig with evergreen task name: documentation key value pairs. Resmoke will print out the documentation for its task_name when a task_name is passed in through the command line and when documentation is available.

Since generated tasks have arbitrary suffixes, we should remove any pure numerical suffixes in the task name after the last underscore. (e.g. "_123" should be removed, but "_abc" should not)