Fix up the bundle support

[qwcode]

fix for #1114

the bundle support had 2 tests before (just for "pip bundle", not for installing bundles), now it has 3, including one for installing bundles.

[qwcode]

@ionelmc, @nOw2 feel free to try.

[ionelmc]

It appears to work. I've did this:

rm -rf /environment || echo OK
virtualenv /environment --system-site-package
/environment/bin/easy_install https://github.com/qwcode/pip/archive/fix_bundle.zip
/environment/bin/pip install --force-reinstall --ignore-installed deps.zip

Strangely enough if I try:

rm -rf /environment || echo OK
virtualenv /environment --system-site-package
/environment/bin/pip install https://github.com/qwcode/pip/archive/fix_bundle.zip
/environment/bin/pip install --force-reinstall --ignore-installed deps.zip

it doesn't work (cause pip doesn't get upgraded). Is that expected behavior ?

Note for @nOw2: virtualenv 1.10 will bundle the broken pip-1.4, you might want to downgrade virtualenv too.

[qwcode]

@ionelmc what doesn't work? what is deps.zip? when I ran pip install https://github.com/qwcode/pip/archive/fix_bundle.zip, pip got upgraded (from 1.3.1 in my case)

[ionelmc]

I think it's fine, I had 1.4.0 installed and https://github.com/qwcode/pip/archive/fix_bundle.zip declared the same version - thus didn't get upgraded. But it kinds breaks the expectation that if you would specify a direct url instead of package name you'll get upgrade/reinstall behavior (eg: pip install -I -U). This is totally different issue however.

[ionelmc]

@qwcode deps.zip is just a pybundle zip