Add enable_new_regions to addons model + db (bug 898332)
Fix intermittent test failure regarding multiple versions
Revert "While reindexing include deleted apps (bug 896782)"

Reverting until we can figure out the infinite loop bugs that this
causes.

This reverts commit 54c33d53519c27d78eb3344d524670b832e48109.
Updated versions mapping to be more ES-like (bug 892618)
Add a property for latest_version to provide a fallback (bug 899034)

Sometimes, latest_version isn't populated for non-incomplete apps,
which breaks some reviewers tools pages.
Merge pull request #936 from muffinresearch/add-enable-other-regions-to-db-model

Add enable_new_regions to addons model + db (bug 898332)
Fix test failures following ec68168010fe779712d30404b4182a66e56892bc