Nodeenv

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- Fixed prebuilt installation:
- cp more choosy. See ` 64`_
- exclude top-level files in prebuilt tar. See ` 63`_

.. _ 63: https://github.com/ekalinin/nodeenv/issues/63
.. _ 64: https://github.com/ekalinin/nodeenv/issues/64

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- Fixed system's node usage. See ` 62`_

.. _ 62: https://github.com/ekalinin/nodeenv/pull/62

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- Added support for prebuilt packages. See ` 56`_
- Added support for python3. See ` 42`_

.. _ 56: https://github.com/ekalinin/nodeenv/issues/56
.. _ 42: https://github.com/ekalinin/nodeenv/issues/42

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- Fixed npm.js redirect. See ` 52`_
- Added ``--update`` option. See ` 25`_

.. _ 52: https://github.com/ekalinin/nodeenv/pull/52
.. _ 25: https://github.com/ekalinin/nodeenv/issues/25

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- Bug fixing in ``freeze``. See ` 47`_

.. _ 47: https://github.com/ekalinin/nodeenv/issues/47

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- Added ``--make`` option