Changes needed to run against PostgreSQL 9.3beta2.

 * pyrseas/dbobject/constraint.py (ConstraintDict._from_catalog): Use
   a class-owned dictionary of match types and adapt it for the change
   in pg_constraint.confmatchtype ('u' is now 's').
   (ConstraintDict.from_map): Use the class-owned match types dict.
 * tests/dbobject/test_{extension, extern_file}.py: pg_trgm is now
   version 1.1.
 * tests/dbobject/test_rule.py: Formatting changes to actions.
 * tests/dbobject/test_view.py: Formatting changes to definition.