Nodeenv

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- Added `NODE_PATH` variable export (for correct module
search after installation via npm)

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- Shows command output when error occurs
- Excluded 'npm' from `freeze` list
- Fixed bug with 'not only letter' names in `freeze` list
- Added global installation for npm >= 1.0 (when install
soft from requirement file)

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- Fixed ``freeze`` output command. See `request 5`_
- Diagnostic message fixed. See `pull 4`_

.. _request 5 : https://github.com/ekalinin/nodeenv/issues/5
.. _pull 4 : https://github.com/ekalinin/nodeenv/pull/4

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- Added option ``--npm`` to install certain npm.js version. Request_ .
- Fixed ``freeze`` command for npm >= 1.0.x.

.. _Request: https://github.com/ekalinin/nodeenv/issues/3

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- Fixed `problem 2`_ with new npm installation script. Added
``--no-npm-clean`` option. The default to the npm 0.x cleanup.

.. _problem 2: https://github.com/ekalinin/nodeenv/issues/2

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- Fixed `problem 1`_ with installation from PyPI via easy_install.
Added ``MANIFEST.in`` file.

.. _problem 1: https://github.com/ekalinin/nodeenv/issues/1