[#315] Change settings.DOMAIN_NAME to settings.RSR_DOMAIN

Change all uses of DOMAIN_NAME to RSR_DOMAIN
[#315] change settings.APP_DOMAIN_NAME to settings.AKVOAPP_DOMAIN

Change all uses of APP_DOMAIN_NAME to AKVOAPP_DOMAIN and use getattr()
where appropriate.
[#315] Change request.app_url to request.akvoapp_root_url

Change all uses of app_url to akvoapp_root_url in  views, templates and
template tags.
Move settings.DEFAULT_FROM_EMAIL from 90-finish.conf to 20-default.conf

Also fix the use of the setting in a couple of places
Change a number of references to www.akvo.org to akvo.org or
rsr.akvo.org as appropriate
[#315] Fix partner site widgets' links when running on CNAME

When a PS widget is shown using the CNAME domain for the PS the links
point to to the akvoapp.org domain.

Fix by using request.META.HTTP_HOST instead of request.akvoapp_root_url
(refactored from request.app_url) where needed or by just using the path
when constructing hrefs.
Update media assets
Merge branch 'develop' (with latest social media fixes) of github.com:akvo/akvo-rsr into release/candidate
[#316] Added fix to force rendering of a scrollbar in partner site project listing widget.
[#316] Fixes for text overflow issues in certain partner site widgets.
[#206] Change API to remove duplicates by default

When querying the API using the depth paramter there are cases where
you can get multiple copies of the same related object, when that
object is related to more than one object of the "root" kind.

Change this so duplicates are filtered out by default. If for some
reason the dupicates are needed use distinct=False in the query string
of the request.
[#315] Merge branch 'develop' of github.com:akvo/akvo-rsr into feature/cname_urls

Conflicts:
	akvo/rsr/templatetags/map.py
	akvo/scripts/asset_manager/map.py
[#329] Limited the all-updates RSS feed to 100 items for now to prevent gateway timeout errors.
Adding information about the hotfix to the RELEASE_NOTES [refs #329, #318]
Merge branch 'hotfix/limit-rss-update-count' into release/candidate
[#342] Fixed 'about' links in RSR and partner site sign in templates.
Merge pull request #358 from peeb/text_fixes

[#342] Fixed 'about' links in RSR and partner site sign in templates.
[#350] Updated policy links in RSR base template.
Merge pull request #359 from peeb/text_fixes

[#350] Updated policy links in RSR base template.
Adding a default value for OLD_PROJECT_MAX_ID