Add query page

[jamesaoverton]

The basics are implemented in #37. We want to add the following features:

• use Ace.js for the textarea (we will also use it for other editing forms; I have a slight preference for Ace over CodeMirror, but there might be other good options)
• history of recent queries in localstorage, so users can repeat recent queries
• list of example queries, loaded from an EDN or JSON file in the project's source tree (similar to test/example/ontology/templates.json)
• paging for table of results (using SPARQL's LIMIT and OFFSET)

[inaimathi]

On the last two points of this ticket. We've got a query page with Ace wired up, and a localstorage-backed query history. It still doesn't have a list of example queries, and it doesn't add paging properties to incoming queries. This work is checked into https://github.com/knocean/knode/pull/37

[inaimathi]

On the last point (add paging with SPARQL's LIMIT and OFFSET settings). Still in the same PR

[inaimathi]

All of the above is done. There's pagination built using LIMIT and OFFSET settings (unless the relevant parts are already manually specified in-query; the test cases cover what I think is the correct behavior).

Also, the front-end interface takes advantage of pagination. There's a "More" button that shows up unless the last requested page was empty. When clicked, this button gets the next page of results.

This task should be closed once we merge the query page branch.