Implementing bounds-limited querying
Implemented throttled queries so view will update as user pans, but not too often
Changed "dropdown" menus to use a caret instead of the info sign
Added a "close" button to size menu
Merge branch 'menus' of https://github.com/XDATA-Year-2/twitter-owf-geomap-instrumented

Merging Ron's improvements to geomap app.