Preserve keys when sorting points hook types

Fixes broken adding of new hooks to points types on the Points Hooks
screen.
Add change log for 1.5.0
Tested up to 4.0-beta1
Ignore L10n Validator warnings for _doing_it_wrong
Update the WP L10n Validator cache
Bump version to 1.5.0
Bump readme.txt version
Update the POT file for 1.5.0