README: mention https://github.com/yyuu/pyenv-pip-rehash
doc: use recommended python versions
Import changes from ruby-build v20141028
Fix broken tests
Need to chdir before running tests of `python-build`
Warn about #264 in the README
Merge pull request #266 from konstantint/patch-1

Warn about #264 in the README
Merge pull request #265 from yyuu/ruby-build-v20141028

Import changes from ruby-build v20141028
Merge pull request #237 from blueyed/doc-recent-python-versions

doc: use recommended python versions
Merge pull request #236 from blueyed/doc-mention-pyenv-pip-rehash

README: mention https://github.com/yyuu/pyenv-pip-rehash
Update python versions in README
use https for download URLs

Conflicts:
	plugins/python-build/bin/python-build
fix one failing test, around mirror URL
fix another failing test with https URL
Merge branch 'use-https' (fixes #262)
Fix "pyenv: version 'system' is not installed" with `pyenv which`

This is a follow-up to de5c61c.
v20141106
Fix broken `setup_builtin_patches`
Add test for built-in python-build's patching feature
Split test files