Only set $PROMPT_COMMAND if we are running in bash.
Include preexec_functions and precmd_functions for zsh.
Updated the ChangeLog for 0.3.3.
Added Wil Moore's endorsement (issue #98).
Change MRI Ruby version used in README from 327 to 385
Merge pull request #100 from mhutchin/master

Change MRI Ruby version used in README from 327 to 385
Sanitize PROMPT_COMMAND before appending to it (issue #99).
Re-add the check if chruby_auto was already appending to PROMPT_COMMAND.
Updated the ChangeLog for 0.3.3.
Added PGP signature for v0.3.3
Updated the README for 0.3.3.
Added PGP signature for v0.3.3
Updated the homebrew recipe for 0.3.3.
setting PROMPT_COMMAND when blank
Merge pull request #101 from dejan/master

Setting PROMPT_COMMAND when blank in auto.sh
updated RUBY_VERSION to 1.9.3-p392
Merge pull request #103 from havenwood/patch-8

updated RUBY_VERSION to 1.9.3-p392
Update the Ruby version in the README.