Allow plan plugin to read from $PLENV_ROOT (useful with Homebrew on Mac).
Merge pull request #282 from janlindblom/feature/improved_plenv_plugin

Allow plenv plugin to read from $PLENV_ROOT
Add _prepend_tree command. Traverse a dependency tree and add it to a path.
Add -P --preview flag to help debug/test command.
Merge pull request #280 from bucaran/feat-prepend_tree
add capability to bash `export`
Merge pull request #278 from jcouyang/export
Add cbjohnson theme.
Merge pull request #276 from charlesbjohnson/cbjohnson_theme
Tiny typo
Merge pull request #272 from TheBestNinja/patch-1
[ssh plugin] 256-colour helper stuff
Added documentation link for ssh helper plugin and further cleanup
Eliminate superficial whitespaces in ssh plugin
changed code indent to 2 spaces for consistency
Merge pull request #269 from wk/master
display ruby version
Merge pull request #247 from Fryie/ruby_version_bira
cmorrell.com theme
Merge pull request #235 from inxilpro/master