altered enviroment file to enable out of db and gdal drivers for postgis 2.1.x and below

environment

# environment variables for postmaster process
# This file has the same syntax as postgresql.conf:
#  VARIABLE = simple_value
#  VARIABLE2 = 'any value!'
# I. e. you need to enclose any value which does not only consist of letters,
# numbers, and '-', '_', '.' in single quotes. Shell commands are not
# evaluated.

#====================================================
#Enable out of db rasters and gdal drivers
#====================================================
#settings according to http://www.postgis.net/docs/postgis_installation.html
#on Ubuntu this file is found here - /etc/postgresql/9.3/main/environment

POSTGIS_ENABLE_OUTDB_RASTERS=1

POSTGIS_GDAL_ENABLED_DRIVERS=ENABLE_ALL