Check that openssl, yaml, readline, zlib are all loadable

Improve detecting LLVM 3.5 from Homebrew

remove sed fallback for help/usage

Fix typo in test/arguments.bats (s/enought/enough/)

37signals renamed themselves to Basecamp, so update sponsor in README

See https://37signals.com/ for announcement post.

Rubyforge was shut down in May 2014. REE in general is a project that
has reached its End of Life. This removes support for REE versions that
can't be downloaded anymore. Newer REE releases can still be installed.

Add Rubinius 2.5.8

Add Rubinius 2.5.6

Add JRuby 9.0.0.0.rc2

Upgrade OpenSSL to 1.0.1p

Add JRuby 1.7.21

Add Rubinius 2.5.7

Upgrade OpenSSL to 1.0.1o

Add JRuby 1.7.20.1

Upgrade OpenSSL to 1.0.1n

Add JRuby 9.0.0.0.rc1

stub rbenv-help for rbenv-install and rbenv-uninstall help messages

Homebrew bumped the version of LLVM installed with `brew install llvm`
from 3.5.1 to 3.6.0. So now users will have to tap homebrew-versions and
run `brew install llvm35` in order to get the version necessary to
install recent versions of Rubinius. The 3.5-specific `llvm-config`
becomes `llvm-config-3.5` accordingly.

https://github.com/Homebrew/homebrew/commit/0196a069a01e455b61778d804ebb81f46e7c31ff

The main "llvm" Homebrew package is occasionally getting updated and is
not guaranteed to be version 3.5. Right now it's 3.6, but that depends
on the version of Homebrew that someone has installed.

This lists through all installed Homebrew packages named "llvm*" and
tests each `llvm-config --version` for "3.5*" until it finds one.