Update README.md

http://cartodb.com/map 404 error.
Update README.md
Update README.md
Update README.md

changed POSTGIS_SQL_PATH='pg_config --sharedir'/contrib/postgis-2.0 to POSTGIS_SQL_PATH=`pg_config --sharedir`/contrib/postgis-2.0
CDB-2052 fixed a missing .net + new ogr2ogr OOM scenario exception handling
maki icons in asset manager dialog almost done
CDB-2004 #resolve - maki icons already added to asset dialog
disclaimer view added
added .rvmrc file to .gitignore
CDB-1100 #first-step - sync now behaviour almost done
CDB-1100 #failure-case - prevents synchronization fails
CDB-1100 #better-failure - synchronization error better explained
buttons at dark infowindow fixed
sprite re-generated
tests added
update map when sync is finished
Readme didn't say to connect to cartodb/base ppa
CDB-2641 Improve geocoder cache by using an upsert
Adds new ip option
Moves geocoder templates to its own folder. Adds aside helper.