Add filter `home_url` – why is this here?

[simonwheatley]

See:

• [x] https://github.com/Automattic/babble/blob/029bc70350d3195ce52e166877f74bf218d32dbe/class-locale.php#L292
• [x] https://github.com/Automattic/babble/blob/029bc70350d3195ce52e166877f74bf218d32dbe/class-locale.php#L304

Questions:

• Why actually is that there?
• Does it need to be there?
• Can we remove either or both?

[simonwheatley]

Also look at whether the home_url filtering, in the Babble_Locale class, is actually optimal.

[simonwheatley]

Fixed line references in the issue description by referencing a specific commit version of the file

[joehoyle]

From what I understand, these filters are needed as illustrated by the above Pull Request for the behat test. However, perhaps we wan't to just comment the code a bit better?

[joehoyle]

I've added more docs to the hooked functions in #315 to explain why the filters are there.

[joehoyle]

@simonwheatley over to you to merge #315 which should conclude this issue.