rename SqliteConnection -> DatabaseConnection,
       SqliteStatement -> PreparedStatement,
       SqliteRows -> ResultSet
       SqliteRow -> ResultRow
refine documentation around Access; expose unsafe pointers for use with ffi
rename BindArg to ParameterValue; refine doc
rename SqliteStep to StepOutcome; refine execute() docs
rename is_update to want_changes
not using feature(globs) after all
example modeled after sfackler's works, modulo blob
  - move select() and query() to lib, where they take FromSql parameter values
  - provide column_text()
  - ToSql/FromSql for time::Timespec (and time::Tm)
  - move ToSql/FromSql to their own types module