Add ree-1.8.7-2009.10
use `wget` if it's available and curl isn't
Add definition for 1.9.3-p194
Merge pull request #138 from tksohishi/master

Add definition for ree-1.8.7-2009.10
rename get -> fetch_url
1.9.3-dev does not need a RubyGems installation
Update to RubyGems 1.8.23
Update changelog for next release. Closes #158
Make a note about Homebrew installs, including --HEAD
Clang -> XCode 4.3+
Add definition for 1.9.2-p320
Default CC=cc in the 1.9.3-p125 definition for Xcode 4.3 compatibility

Fixes #145
1.9.3-p0 and 1.9.3-p125 should get the RubyGems security fixes too
Merge pull request #140 from jayferd/use-wget

use `wget` if it's available and curl isn't
1.9.2-p180 needs non-llvm gcc (ref #137)
Improve the OS X llvm-gcc error
Clearer call to action (thanks @trevorturk)
Clean up fetch_url
fetch_git shows an error if git is not installed
Swallow all `type` output