first pass at a ui for excel export
add configurable export classes; better validation&form handling; first pass at periodic summary excel exports
functional async export. still needs some stylin.
replace tabs with spaces to be consistent
load contact list through ajax to make the export page more responsive
remove extraneous template. fix styling & ui flow.
clean up js
CHANGE PLACE_IN_REQUEST to default to country
move export views into async tasks
finally fix the loader view refresh issue to look ok
don't need to roll back stock quantity if datespan ends later than now
fix up the various export payloads, over the right time period, & unicode support.
Merge branch 'ghana-excel-export' into ghana-dev
fix reference to ajax_loader in soil