changes for super ambassador
Merged from upstream
Super ambassador feature
Merge pull request #158 from ialja/master

404 and 500 templates added, check and improve
manually merged sparkica-fea_ambassador
Merge pull request #159 from goranche/master

manually merged sparkica-fea_ambassador
Merge pull request #157 from sparkica/fea_ambassador

Fea ambassador
Fixed bug in api/signals.py, country_code wasn't being set correctly
Merge pull request #162 from goranche/master

Fixed bug in api/signals.py, country_code wasn't being set correctly
fixed social buttons links, added FB recommend on top of share
displaying event start date instead of countdown