Version bump to 0.3.8.
Install ruby-install 0.3.3.
Revert "skip travis build for pgp signatures"

This reverts commit 62f3bde90653780d36965bb3df42c6c84fa145c3.

Conflicts:
	Makefile
Updated the ChangeLog for 0.3.8.
Updated the README for 0.3.8.
Oops, re-added the PGP signature commit.
Added PGP signature for 0.3.8
Updated the homebrew formula for 0.3.8 (@havenwood).
Updated the RPM spec for 0.3.8.
Link to the capistrano chruby plugin.
Link to the Chef cookbook for chruby.
Link to the Puppet Module for chruby.

* Does it require Boxen?
Order list alphabetically.
Avoid using the variable name path, since zsh apparently uses it.
Allow specifying an alternate --version flag.
Use -V if --version is not recongized.
Mention brew install --HEAD.
Also include ruby env variables in the bug report.
Select exact Ruby specified if available.
Merge pull request #234 from havenwood/select-exact-match

Select exact Ruby specified if available.