literal_binds not passed through for crud

[Mike Bayer]

>>> import sqlalchemy as sa
>>> 
>>> stmt = sa.update(sa.table('x', sa.column('q', sa.Integer))).values(q=5)
>>> print stmt.compile(compile_kwargs={"literal_binds": True})
UPDATE x SET q=:q

see https://github.com/zzzeek/sqlalchemy/pull/232/files.

[Mike Bayer]

• add literal_binds for delete() statements in addition to insert()/update()
• move tests to CRUDTest
• changelog, fixes #3643

→ <<cset 150591f9e0a9>>

[Mike Bayer]

• add literal_binds for delete() statements in addition to insert()/update()
• move tests to CRUDTest
• changelog, fixes #3643

(cherry picked from commit 150591f9e0a94902cb2a76b68ac7c9d8a1a3ec83)

→ <<cset e2404a4e3fbe>>