Jira Online Node

**Jira Online Node**

- basic filters: crated/resolution date
- connection check
- JQL (Jira Query Language) filter
- only first 50 issues (this will be changed in the next pull request)
- no commets included in result (this will be also changed)

Fixed all issues mentioned by @majchmar in #117, and resolved the conflict so it can be now automatically merged.