Use current Python for hooks, better source dist, better docs, --vers…

…ion.

Hooks, config, .cookiecutters/, and more!

Windows support officially added.

Fix copying of binary files in nested paths.

* Depend on Jinja2>=2.4 instead of Jinja2==2.7.

* Fix errors on attempt to render binary files. Copy them over from the project
  template without rendering.
* Fix Python 2.6/2.7 `UnicodeDecodeError` when values containing Unicode chars
  are in `cookiecutter.json`.
* Set encoding in Python 3 `unicode_open()` to always be utf-8.

* Improved project template finding. Now looks for the occurrence of …

…`{{`,

  `cookiecutter`, and `}}` in a directory name.
* Fix help message for input_dir arg at command prompt.
* Minor edge cases found and corrected, as a result of improved test coverage.

* Config is now in a single `cookiecutter.json` instead of in `json/`.

* When you create a project from a git repo template, Cookiecutter prompts
  you to enter custom values for the fields defined in `cookiecutter.json`.

* Friendlier, more simplified command line usage.

* Can now use Cookiecutter from Python as a package.
* Internal refactor to remove any code that changes the working directory.

* Only takes in one argument now: the input directory. The output dir…

…ectory

  is generated by rendering the name of the input directory.
* Output directory cannot be the same as input directory.

Takes in command line args for the input and output directories.