Report exceptions invoking git as failure when check_exit specified.
Added a utility file with XMigra.dedent.
Fixed generation of new migration template with Psych-based YAML.
Added support for PostgreSQL databases.
Minor corrections to Microsoft SQL Server support.
Merge branch 'feature/psql-support' into develop.
Bumped version.
Updated README.md to indicate support for PostgreSQL.
Merge branch 'release/1.2.0' into master.