examples: add two new examples

[mskorzhinskiy]

As promised, here one of the exporting view example and possibly useful example about integration with org-jira.

Feel free to modify anything here to your liking.

[alphapapa]

FYI, in the branch wip/with-time, I'm adding a :with-time argument to the timestamp predicates, which will simplify the code in this example.

[mskorzhinskiy]

Cool, will try, thanks.

By the way, do you want to merge these examples, you want to wait a bit to merge some other features (like with-time) and then merge it or are you going to drop this request? Either way is fine with me.

[alphapapa]

I'm close to finishing the with-time branch, so I think it would be best to do that, then update the examples. Also, it would be helpful if there were a bit more explanation for each one; as it is, it seems like some reading of the code is needed to understand what they do. :)