Made more stable airbnb importer

Hopefully fixed HTML entities issue.
Added simple test case for airbnb import
Moved list_item_form back into main file to fix insert error
Added in a loading bar

Added a nanosbar that fake loads the web page to give the illusion of
progress. Small bug at the moment, but pushing anyway.
Made the nanobar progress smoother

Increased the changes per second to give a smoother loading effect.
Optimised for around 10 second load.
Merge branch 'spinner' into proper-items