[#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
[#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
Merge branch 'develop' of github.com:akvo/akvo-rsr into release/candidate
fix for #327 Release notes update
Merge pull request #363 from akvo/adrian-327

fix for #327 Release notes update
[#313] Project admin template updated to only grey out Save buttons when clicked. Previously all buttons were being greyed out which breaks numerous other UI interactions.
Merge branch 'develop' of github.com:akvo/akvo-rsr into release/candidate
[#313] Modified jQuery code to only select button children of class submit-row. This should catch all input buttons regardless of what labels or names they have.
Merge branch 'develop' of github.com:akvo/akvo-rsr into release/candidate
[#313] Fixed jQuery selector chain.