Remove test_long_identifiers from test_sqlalchemy.py because SQLAlchemy removed the 30 character limit on identifiers.
Remove test_long_identifiers from test_sqlalchemy.py because SQLAlchemy removed the 30 character limit on identifiers.

See https://bitbucket.org/sqlalchemy/sqlalchemy/commits/d5fcb7b91bc16ebb22ca1e34e6a734923d6495a8 and http://code.google.com/p/pymssql/issues/detail?id=44

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