Release 1.3.5

Changes since v1.3.4

• Disclaim compatibility with Python 2.6.
• Make output tarball from makesdist reproducible.
• Add convenience script debug.py for debugging unit tests.
• Allow iterators and generators in Structure init.
• Include micro field in sphinx version.
• Move package files to the src directory.
• Switch to automated TestCase discovery.
• Use the with context manager to close files.
• Make setup.py compatible with both Python 2 and 3.
• Avoid use of exec when working with AtomEye XCFG format.
• Remove unused exception IsotropyError.
• Return bool from SymOp.is_identity.
• Convert starred imports to explicit ones.
• Always update Atom.xyz, _U arrays in place.

Release is also available at https://pypi.python.org/pypi.