Integration with atlassian wiki / jira

[fabinca]

Is your feature request related to a problem? Please describe.
I'm always frustrated when someone is asking something, that is answered in our internal wiki and then I have to go to the wiki to find the article.

Describe the solution you'd like
It would be nice if the slack bot could do this.

Describe alternatives you've considered
wiki <Optional: space> <search keyword>
jira <Optional: board> <search keyword>
can provide a list of the three top results for this keyword (including link & preview)

[fabinca]

started working on this