jira/client: Extend VersionService and fix Issue

Added Create and Delete for VersionService.

Removed StatusCategory part from the Issue resource struct, it is not good for
anything and there was a problem with unmarshalling, so that is solved.

Change-Id: 7e23ab1421
Story-Id: SF-6
errors: Add a function for printing Error

Change-Id: 3c678aaafb
Story-Id: SF-6
wip

Change-Id: f7694d751c
Story-Id: SF-6