* Partial scan: scan values may be partially scanned (by index or name) or skipped/ignored by passing nil pointer(s).
* Null value: by default, empty string and zero time are bound to NULL for prepared statement's parameters (no need for NullString, NullTime but still supported).
* Null value: Stmt.*Scan* methods return default Go zero value (0, "", ...) for SQL NULL (no need for NullInt64, NullString, NullTime but still supported).
* Correctly retrieve the time returns by `select current_timestamp` statement.
* Correctly retrieve the time returns by `select current_timestamp` statement or others expressions: in SQLite, [expression affinity](http://www.sqlite.org/datatype3.html#expraff) is NONE.
*[Full control over connection pool](https://code.google.com/p/go/issues/detail?id=4805)