'Get a transitionid available on the specified issue to the current user.
Look at https://developer.atlassian.com/static/rest/jira/6.1.html#d2e1074 for json reference
:param issue: ID or key of the issue to get the transitions from
:param trans_name: iname of transition we are looking for'

def find_transitionid_by_name(self, issue, transition_name):

    transitions_json = self.transitions(issue)
    id = None
    for transition in transitions_json:
        if (transition[u'name'].lower() == transition_name.lower()):
            id = transition[u'id']
            break
    return id
