allow admin to create new abstracts from rails_admin. fix error when ebrite imports without new tickets.
add deadline to prevent abstract modifications. fix error in eventbrite importer.
minor content changes. add new attribs to abstracts and enrich tests.

resize map.png. add pdf link to map image. setup deploy for indra env.
add new feature tests for abstract and location page.
minor updates to abstract assignments and views.  add method to import abstract data from excel.
Merge pull request #1 from ucsd-iem/spreadsheet_import

Spreadsheet import