Read series name in bfopen() (rebased onto develop)



This is the same as gh-557 but rebased onto develop.

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- Use series name for label generation in `bfopen` as suggested by Allon Klein (see http://lists.openmicroscopy.org.uk/pipermail/ome-users/2013-June/003782.html)
- Add unit tests for the `bfopen` function (to be run as part of the unit test suite)

/cc @ctrueden