Fixed stale database connection release
 - getAutoCommit, rollback and commit can throw exceptions
   on stale connections, which was preventing
   a correct connection release
Implement toSingleBox.

The toSingleBox method takes a List[Box[T]] and turns it into a
Box[List[T]], via an implicit conversion to ListOfBoxes.
narrowed catch clause in connection-release,
 changed loglevel to error
Merge pull request #1526 from rofreytag/db_realeasecon_fix

The methods getAutoCommit, rollback and commit can throw exceptions on stale connections. This PR implements corrected error handling during the connection releasing process so bad connections don't just hang around.
Simplify the toSingleBox implementation.
Update toSingleBox doc to state that List sizes may differ.
Merge pull request #1525 from lift/msf_issue_1525

Implement a helper for Iterator[Box[T]] => Box[List[T]]
Merge branch 'master' into lift_30