install pip via setuptools 0.8.x
Use @coderanger's suggested way(#r5274401) to check setuptools are installed.
retrieve ez_setup.py only if `import setuptools` is failed.
Merge pull request #48 from ka2n/setuptools_0_8_x

Use setuptools instead of distribute
Bump version for release.
Update changelog.
Bump version for release.
[COOK-3125] Use default instead of normal attribute for python bin

Signed-off-by: Seth Vargo <sethvargo@gmail.com>