Fix error messages of Anaconda/Miniconda
Prefer gawk over awk if both are available.
Import recent changes from ruby-build 20140420
Update setuptools (3.4.4 -> 3.5.1)
Update pip (1.5.4 -> 1.5.5)
Add PyPy-2.3
Merge pull request #162 from fgimian/pypy-2.3

Add PyPy-2.3
Add `pypy-2.3-src` (refs #162)
Merge pull request #1 from yyuu/master

Updated stable stackless python versions