Add a couple more useful features (at least for me)

[asfaltboy]

New commands

• relations - show all external project links for a given project/version
• changelog - generate a simple text list of issues for project/version grouped by type
• _releasenotes - generates a rich issues list (markdown formatted) for a given project (or all) released on a specified date
• latestrelease - get the latest version released for all projects (with link to release notes)

  Other changes

• support both REST/RPC versions of calls where applicable (REST form is more detailed and is required for some of the new commands above)
• new option --timelog to issue command (see total time spent "In Progres")
• new option --long to issue command (displays description)
• new option --version to issues command (display only issues for specified fixVersion)
• new column RELEASE DATE in versions command
• new column ID in projects command

  To do / things not working

• [x] Update work-log when transitioning issue (--time)

Hey @trentm I seem to have used my own master tree which includes both of my other Pull-Requests, would you have me separate the tree or will you consider merging them all?

[trentm]

@asfaltboy Sorry about this. Obviously this PR is ancient now. In the meantime jirash was re-written in node.js. lib/jirashell.py is dead code that I'm going to remove.