V2.0.7 Batch API support

V2.0.7 add a major feature: Batch API.

see docs/batch.md

v2.0.2

1. remove unused 1.0 classes such as @table, @column, @id
2. move core classes from package object into package (SQLWithArgs, JdbcValueAccessor, ResultSetMapper, JdbcValue)
3. add new method joinRows2, joinRows3, joinRows4, joinRow2, joinRow3, joinRow4
4. BeanBuilder enhanced(in next version, it maybe moved out scala-sql)

scala-sql Goes to V2.0

New user please using the 2.0.x serial