Add rbx-2.2.10

add jruby-1.7.13

Add rbx-2.2.9, 2.2.8 was skipped due to broken wrappers.

Fix `fetch_git` with `--keep`

Update existing git repo if exists, or clone if not exists.
The destination repo might exist if the `--keep` was supplied for `ruby-build`.

OpenSSL library updated to 1.0.1h

Previous versions of the library contain a vulnerability CVE-2014-0224.

The script handles bumping up the version number, committing, tagging
and updating the Homebrew formula. The last step requires `hub` to be
installed in order to submit a pull request to Homebrew.

/cc @sferik @hsbt

[ci skip]

Fixes #548, closes #551

This is so any 3rd-party definitions continue to work even if they have
MD5 checksums embedded.

A more secure hashing algorithm makes it less feasible to serve up a
modified tarball that matches the same checksum.

See the discussion in #548

add rbx-2.2.7

added definition of 1.9.3-p547

This reverts commit d45f1451, reversing
changes made to 13de5110.

Added definition of 2.0.0-p481

Ruby 2.1.2 is released!

link the latest log to /tmp/ruby-build.latest.log

Make the downloading message print the actual file name, not just the package name plus .tar.gz.

Correct the JRuby 9000 snapshot directory name.

`mktemp -t ruby-patch`, although working on OS X, fails on Travis CI
with the message "too few X's in template".

https://travis-ci.org/sstephenson/ruby-build/builds/23436088

[picture of I Have No Idea What I'm Doing dog]

https://travis-ci.org/sstephenson/ruby-build/builds/23435342

Filenames in git diff patches are prefixed by default by "a/" (source)
and "b/" destination. Such patches don't work with ruby-builds `--patch`
option since it internally uses `patch -p0`.

Prior workarounds were to use either an intermediate step:

    filterdiff --strip=1

or to generate the patch without the prefix in the first place:

    git diff --no-prefix ...

Now, git diff patches are detected by searching for this pattern:

    diff --git a/...

And `patch -p1` is used by default in such cases to strip the 1st
component of filename paths.

Fixes #521, closes #484