[oracle] support jdbcoracle adapter name
review test db setup - notes no longer relevant for latest XE
separate out Postgres test that do not need a DB 
+ update WITH test
support running single test file on 1.8 (require 'rubygems')
separate out DB2 test that does no require a DB
expose select? and insert? helpers on JdbcAdapter class
[oracle] should support WITH statements (as well)
refactor and share a format type helper with oracle