add python 3.5.0a2

Remove dead links to History and License from README

Cfr. #688

Add python3.5.0a1

Add python3.4.3

Remove history, license information from README

Remove warning about extraneous "ruby-" prefix in `.ruby-version`

Add Miniconda / Miniconda3 3.8.3 release

Update README to make rbenv version consistent with previous `versions` output

The `rbenv versions` info highlights 1.9.3-p327 as the current version, and
making `rbenv version` sample output match that helps make it clearer.

[README] Updated link to bundler.io

The license information is already present in the LICENSE file.

We won't maintain it anymore. Instead, the changelogs can be obtained
from the project's Releases page: https://github.com/sstephenson/rbenv/releases

When we started to support reading `.ruby-version` files, we made a
commitment to not support fuzzy version matching. Treating "ruby-2.1.5"
as "2.1.5" is a sort of fuzzy matching, so we put in place a warning
telling you to remove the extraneous "ruby-" prefix popularly used by
other Ruby version managers to denote MRI. (Their logic is that MRI is
"ruby" and other rubies are not "ruby", apparently.)

However, people are often not able to remove the prefix in their
projects because they want to support other coworkers and tools that
sadly still require the prefix, like RubyMine.

So to restore sanity for a big portion of our users, the warning is gone.

Since communal-gems is maintainer-approved, thought it would be useful to include the directory it uses in the ignore list.

(This also helps me, since I install rbenv as submodule and without this entry, the submodule is perpetually marked dirty.)

Update README.md - clone through https instead of git

git:// protocol is blocked by a lot of servers, https works fine.

Use better image for Travis build status

Update README.md

Made it consistent with the rbenv documentation by having the cloning step in the installation clone it directly into the home directory.

add patches to stop '/Library/Python/X.X/site-packages' from being added to sys.path

Unset PYTHON_CFLAGS for build tests