pyenv 20140628

Changes:

* python-build: Add new Anaconda releases; anaconda-2.0.1, anaconda3-2.0.1
* python-build: Add new PyPy3 release; pypy3-2.3.1
* python-build: Add ancient CPython releases; 2.1.3, 2.2.3, 2.3.7
* python-build: Use `ez_setup.py` and `get-pip.py` instead of installing them from tarballs
* python-build: Add support for command-line options to `ez_setup.py` and `get-pip.py`