CDB-4103
CDB-2769
Merge pull request #776 from CartoDB/CDB-2769

CDB-2769
Merge pull request #775 from CartoDB/CDB-4103

CDB-4103
CDB-3856 Check for error message existance before raising exception
CDB-3856
Merge pull request #777 from CartoDB/CDB-3856

CDB-3856
CDB-1755
CDB-1755
Merge pull request #778 from CartoDB/CDB-1755

CDB-1755
CDB-3164
Refresh image screenshots
Fix documentation around cartodb postgresql extension
Change Node.js and cartodb-postgresql extension dependencies
Add twitter handles.
Removed mix panel events when import is successful or failed
CDB-3164
Merge pull request #780 from CartoDB/CDB-4104

Removed mix panel events when import is successful or failed
CDB-3164 micro-fix for logging
Merge pull request #779 from CartoDB/CDB-3164

CDB-3164