fix psql_create_database define

Today I started getting this error when creating a new node:
createdb: database creation failed: ERROR:  encoding UTF8 does not match locale en_US
DETAIL:  The chosen LC_CTYPE setting requires encoding LATIN1.
found the solution here:  http://stackoverflow.com/questions/8351436/change-lc-ctype-for-postgresql-and-postgis-use