link the latest ruby-build.$SEED.log and ruby-build.$SEED/ to ruby-build.latest.log and ruby-build.latest/ respectively
Adding JRuby 1.7.12
Merge pull request #552 from robdaemon/jruby_1712

Adding JRuby 1.7.12
Prefer ggrep for grep invocations that use GNU extensions.
Merge pull request #554 from LawnGnome/solaris-grep

Prefer ggrep for grep invocations that use GNU extensions.

Fixes ruby-build on Solaris 11.1
ruby-build 20140420
Correct the JRuby 9000 snapshot directory name.
Make the downloading message print the actual file name, not just the package name plus .tar.gz.
Merge pull request #559 from chrisseaton/fix-jruby-9000-package-name

Correct the JRuby 9000 snapshot directory name.
Merge pull request #560 from chrisseaton/downloading-filename

Make the downloading message print the actual file name, not just the package name plus .tar.gz.
Merge pull request #535 from Fleurer/patch/1

link the latest log to /tmp/ruby-build.latest.log
released 2.1.2
Merge pull request #566 from sstephenson/ruby-2-1-2

Ruby 2.1.2 is released!
ruby-build 20140509
added definition of 2.0.0-p481
Merge pull request #567 from sstephenson/2-0-0-p481

Added definition of 2.0.0-p481
Revert "Merge pull request #535 from Fleurer/patch/1"

This reverts commit d45f145197612f2b012d7dc3522949e719568371, reversing
changes made to 13de51105bcf927cbd01d05b69c695ddd3bfd1b9.
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`.
Add tests for `fetch_git`
Surely update local git working copy