Enables PostGIS support for Postgres 9.2
Merge pull request #70 from engineyard/postgis2

Enables PostGIS support for Postgres 9.2
Adding PostGIS 1.5.8 and Postgres 9.2 support
Merge pull request #71 from engineyard/postgres92_GIS15

Adding PostGIS 1.5.8 and Postgres 9.2 support
Fixed undefined "app"
fixed error in PostGIS2 recipe
Merge pull request #83 from engineyard/refactored-postgis

fixed error in PostGIS2 recipe
Merge remote-tracking branch 'upstream/master'