Vulture

* Report `while (True): ... else: ...` as unreachable (thanks RJ722).
* Use `argparse` instead of `optparse`.
* Whitelist Mock.return\_value and Mock.side\_effect in unittest.mock
module.
* Drop support for Python 2.6 and 3.3.
* Improve documentation and test coverage (thanks RJ722).

* Detect `async` function definitions (thanks RJ722).
* Add `Item.get_report()` method (thanks RJ722).
* Move method for finding Python modules out of Vulture class.

* Detect unsatisfiable statements containing `and`, `or` and `not`.
* Use filenames and line numbers as tie-breakers when sorting by size.
* Store first and last line numbers in Item objects.
* Pass relevant options directly to `scavenge()` and `report()`.

* Detect unsatisfiable `while`-conditions (thanks RJ722).
* Detect unsatisfiable `if`- and `else`-conditions (thanks RJ722).
* Handle null bytes in source code.

* Add `--min-confidence` flag (thanks RJ722).

* Detect unreachable code after `return`, `break`, `continue` and
`raise` (thanks RJ722).
* Parse all variable and attribute names in new format strings.
* Extend ast whitelist.