[#268] Add Piwik analytics

Add django-piwik to requirements

Add settings for Piwik

Add template tags in rsr/base.html and partner_sites/base.html for Piwik

Conflicts resolved in:
	scripts/deployment/pip/requirements/2_rsr.txt
[#268] Add Piwik template tags to widgets
[#251] Changed form text from 'Add update' to 'Submit update'.
[#216] Changed string "water and sanitation" to "development aid".
[#215] ISO country string changed for country code PS.
[#279] Added static map images to media assets.
[#279] Commented out dynamic maps and pasted in static placeholder images.
[#279] Added CSS to centre static map images.
[#279] Removed stray trailing > from global project map template.
[#279] Added disclaimer to global maps explaining static image regression.
[#279] Styled disclaimer text.
Removes Footer Labs Link Closes #280
Release notes for v2.2.0.1
[#139] Changed default server domain to rsr.akvo.org.
Updated akvo.rsr.middleware.get_domain helper function to support 4 part domain names and to pass through rsr.akvo.org as is.
[#263] Added Apache config for W3 Total Cache 0.9.3.
[#139, #263] Corrected the log file names for the Akvo home page config.
[#139, #263] Added revised Apache configs for the interim Akvo home page and subdomained RSR.
[#139, #263] Moved the server_down.html section nearer the top of the live home page Apache config.
[#139, #263] Split the home page and RSR Apache configs for the test server into separate config files.