Update model.php

Bugfix: getByTags not working (backend)

Faq records with the tag added did not show in the list of used tags.

How to simulate problem?
- Add a tag to a faq question
- Goto Backend > Modules > Tags > [select tag] > Edit
- The faq question is not listed
Merge remote-tracking branch 'forkcms/master'
Image name conflicts - fixes #608

WorkingLanguage was used to make names unique across multiple languages
Add method to check if a user is in a certain group

This is an extension to the api that the groups module provides to other
modules. In some modules it can be convenient to check if a user is in a
certain group.

I already submitted this once, but was asked to resubmit for 3.7, see
https://github.com/forkcms/forkcms/pull/698
Merge remote-tracking branch 'origin/master'

Conflicts:
	backend/modules/faq/engine/model.php
cleanup unneeded file (wako merge)
Fix: spinner.gif image cannot be loaded

When going to this backend page: /private/nl/settings/email
you will find that the spinner.gif image cannot be loaded.
Fix: ds.png image cannot be loaded

When going to this backend page: /private/nl/form_builder/edit?token=xxxxxxxxx&id=1
you will find that the ds.png image cannot be loaded.
Fix: favicon.ico cannot be loaded

When going to this page: /src/Api/V1/docs/index.htm
you will find that the favicon.ico cannot be loaded.
The default frontend theme (when chosing no theme in backend) could not load the Head.tpl and Footer.tpl.
Merge pull request #780 from bart-lysander/url-fixes

Some small url fixes
Fixed: when going to the page /api/V1/client you will get a "Please provide an existing template." Exception error.
Fixed: error loading Client.js
Update change log
Merge pull request #781 from bart-lysander/url-fixes-2

Api client: some small fixes
Merge pull request #758 from ikoene/blog-image-name-conflicts

Image name conflicts - fixes #608
Add missing items in changelog.
Fix merge conflicts
Merge branch 'jonasdekeukelaere-fix-contentblock-positions'
Merge pull request #777 from turanct/is-user-in-group-3.7

Add method to check if a user is in a certain group
Prepare for release 3.7.1