Sync Redmine versions/issues with Github milestones/issues

[rthrash]

Redmine uses issues and assigns them to versions. Github uses milestones for the versions. Would be great to maintain this data, if relatively straightforward.

Rm API: http://www.redmine.org/projects/redmine/wiki/Rest_Versions
Gh API: http://developer.github.com/v3/issues/milestones/

Implementation notes

Retrieve all Redmine versions (version) for a project (project name): name, description, status, due_date, fixed_version_id
note: fixed_version_id is the ID of the Target Version (previously called 'Fixed Version' and still referred to as such in the API)

Create Milestones in Github: title, state, description, due_on, milestone

In Redmine you can list the versions. :ID can be either the integer ID of the project or the short URL identifier (e.g., "revo"):

GET /projects.xml
GET /projects/:ID/versions.xml

In Github, you can list milestones (to check if they exist first) with the following. Assign milestones by ID, not the milestone name/title:

GET /repos/:owner/:repo/milestones

Finally, if we want to maintain any other statuses, or other data, we need to push them to labels in Github.