Icinga Web JIRA Integration v1.1.0

• FIX: Render status badge in case there is no related icon (#39)
• FIX: Use the same notification header via Web Form and CLI (#42)
• FIX: broken IssueDetails link has been fixed (#31, #48)
• FIX: we're sending Content-Length to make proxies happy (#51)
• FEATURE: Show status for created issues (#44)
• FEATURE: Allow choosing a default template (#36)
• FEATURE: Add configurable duedate for created JIRA issues (#37)