Fix /bin/sh compatibility issue in install.sh
gitfast: update to upstream v1.8.4

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
don't clobber existing RBENV_ROOT & follow Homebrew's default behavior
Added/modified some useful aliases.
catimg plugin
allow to print an image to the stdout using convert
Fix for virtualenv support - fixes #2328, fixes #2297, resolves #2319
Fixed a dirs bug for catimg
catimg: fix exit without using source
supresses errors from convert whilen converting, as they
are usually just warnings
typo fix
Add rdmtc alias for rails plugin.
Add support to command "show"
Fixes rvm_prompt_info() in lib/rvm.zsh
Returns false when rvm is not found.
Returns false when rbenv is not found.
Adds chruby_prompt_info dummy function.
Joins ruby prompt files and adds ruby_prompt_info.
Refactors ruby_prompts.zsh
new faster SVN plugin
Adds all other dummy implementations.
Adds documentation.