Bump tested-up-to version to 4.0. (trunk)

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5460 9866e705-20ec-0310-96e7-cbb4277adcfb
Use the correct `EMPTY_TRASH_DAYS` const.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5462 9866e705-20ec-0310-96e7-cbb4277adcfb
Bump NPM package versions in `package.json`
* "grunt-sass": "~0.14.0 -> "~0.14.1"
* "grunt-wp-i18n": "~0.4.7 -> "~0.4.8"
* Requires `npm install` to update packages and dependencies





git-svn-id: https://bbpress.svn.wordpress.org/trunk@5463 9866e705-20ec-0310-96e7-cbb4277adcfb
Merge branch 'master' of git://bbpress.git.wordpress.org into bump_functions