Py-backwards

Compilation succeed:
target: 2.7
files: 1
took: 0.28 seconds
Additional dependencies:
pathlib2
six

* transformer 3.3: import [pathlib2](https://pypi.python.org/pypi/pathlib2/) instead of pathlib
* transformer 2.7: imports from [six moves](https://pythonhosted.org/six/module-six.moves)
* transformer 2.7: metaclass

* String literals transformer 12
* error: package directory '...' does not exist https://github.com/nvbn/py-backwards-packager/issues/1
* Allow to run py-backwards on systems with python < 3.3 23

* 24 Set correct target to FormattedValuesTransformer
* 19 Accept more than one input
* 11 Set correct target to DictUnpackingTransformer
* 22 Setup.py integration? [py-backwards-packager](https://github.com/nvbn/py-backwards-packager)
* 21 Format string back-porting breaks when using variable annotations

* print additional dependencies after compilation:
bash