Search based on when an issue or merge request was created, closed, merged or last updated
### Description
It would be great if we can search using dates to search states like created, closed and updated.
### Proposal
What I'm proposing is some similar to this:
`author:@mdbs99 closed:2017-03-1..2017-03-10`
In that example the system will search the state closed between 2017-03-1 and 2017-03-10
### Links / references
See Github's article about searching [here](https://help.github.com/articles/searching-issues/#search-based-on-when-an-issue-or-pull-request-was-created-or-last-updated).
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