Created pg/pgutil package, moved formatColumnName function there as Underscore()
Merge pull request #5 from Babazka/feature/make_formatColumnName_public

Make formatColumnName public
Support encoding values of pointers, including nil -> NULL
Merge pull request #6 from go-pg/feature/can_write_pointers_and_nulls

Support encoding values of pointers, including nil -> NULL
Don't retry on dbError.
all: add support for sql.Null* types.
README: listed all supported types
README: links to standard interfaces
Merge pull request #8 from go-pg/feature/list_all_supported_types_in_readme

List all supported types in README
Remove debug log.
Use driver.Valuer interface.