EUCA-7352
Take loader code from images landing page and reimplement in landing_page_base. Add attribute for 'found_msg' to each landing page View, and add needed elements to each template. Add missing loader messages to properties file.
EUCA-7352
Turn off the loader after 15 seconds - probably safe to assume the collection is empty because there just isn't anything to display.
EUCA-7352
Show loader until the collection is filled with models, or until a 15 second countdown has elapsed. If the collection loads before then, show the number of records it contains. If it does not load within 15 seconds, assume that there are none coming and turn off the loader, displaying the number of records found (zero) message.
Merge pull request #195 from eucalyptus/EUCA-7352

EUCA-7352 - Loader spinner thing for all landing pages.