Revert PostGIS 2.0.3 upgrade - back on 1.5.3

This reverts commit e93b237d4ed092fe3485c3e770795c3879d11643.

Revert "Ensure PostgreSQL and PostGIS are reinstalled"

This reverts commit 1a54dc299388e776be69aee2f9a9df4b4ad52bba.

Revert "Fixed PostGIS install issue, would install latest PostgreSQL :("

This reverts commit 9320aae23109a8e46aeeb8e7bdd255ac84c2a8f4.

Revert "Log postgis output"

This reverts commit a306bdfb6d69723f3d30ad80f821859fce59cff6.

Revert "Ensure PostgreSQL and PostGIS are reinstalled"

This reverts commit 298bb24834dc008af6459115b8239cc2705040b1.

Revert "Updated PostGIS module - now requires PostgreSQL to be installed first"

This reverts commit 81874989389904381d9d6b4714019ad27499198e.

Revert "Updated PostGIS to 2.0.3"

This reverts commit 827cd4f896e7c10b00e936cbc62537e923c88fe1.

Moved some of the PostGIS installation improvements in from PostGIS upgrade