Removed nested-iter.py as it is a rather misleading example.  Fixes #343
subtree merge blosc v1.3.4
subtree merge blosc v1.3.5
Updated release notes
Fix AttributeError at import time on some 32bit platforms (clases: gh-334)
Better detection of the -msse2 compiler flag
Improved release notes
Fix build with python3
Update docs and VERSION file in preparation of PyTables 3.1.1
Fix verbose mode for unittests
Update the release date
Merge branch 'release-3.1.1'
Merge branch 'master' into develop
Post-release commit
Fixed typo in example
Merge pull request #348 from mdxs/patch-1

Fixed typo in example
Fixed table iterator (closes #347)

The table iterator now checks that the HDF5 file is still open before
trying to read from it.
Better control of verbosity in tables.tests.test
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