Fix Python 3.3 test failures.
Merge remote-tracking branch 'upstream/develop' into develop
Fix errors under Python 3.

Move checks of exception message into the except block.  In Python 3, the exception is deleted when execution leaves the except block.
Fixed Python 3 failure in test_vlarray.py.

The test was incorrect - it was passing under Python 2 by coincidence only.
Added an __iter__ method to tables.Column.

It loads data from the table in chunks.  Iteration is much faster than previously.
Additional tests for iteration over a Column.
Eliminate list in call to min.
Issue 203 fix.
Issue 204 fix.
Fixed bug in test code.
Also pre-load libbz2.dll
Merge pull request #205 from cgohlke/patch-1

Also pre-load libbz2.dll