more button works

link at end now says `more...`

now keep track of the result offset in window.from. refactored
making a query request into query. keyup checks if search term
has changed and only calls query if it has. more also calls query
after adding 10 to window.from.

response handler only clears the result list if the offset is 0.
Merge pull request #47 from dgreisen-cfpb/more

more button works