Added task to remove expired invitations
Resending and removing invitations after a specified time
Add delete invitation button
Small refactoring
modify models to have attributes on items, wrap for old models
adds upload support for fixtures with item attributes
added excel download for items-with-attributes
update web-edit-ui for item-attribute
make fixture XML output to have item-attributes
do not fail if there are no fields or no properties on a fixture-type
responding to PR (typos, style etc)
catch and report XML generation exception better and fix tests
Merge branch 'master' into uservoice-pending-invitations
Update the text when invitation is expired
Merge branch 'master' into uservoice-pending-invitations

Conflicts:
	corehq/apps/style/static/style/lib/bootstrap-3.2.0
Merge branch 'master' into uservoice-pending-invitations

Conflicts:
	corehq/apps/style/static/style/lib/bootstrap-3.2.0
add test for normalize_date
Merge branch 'master' into fixture-prop
Code refactoring
fix default value for uploads without attributes