Change default zshrc to export $ZSH (as required by check_for_upgrade.sh).
Update the script to account for the changes in 0.1.7 where .gas is a directory
Add zsh_reload which provides src function, this function will source .zshrc and rebuilds cache
`setopt append_history` is not necessary.

Especially given the inc_append_history option, it is not necessary to
set the (default) append_history option.
Added v as a keybinding to edit-command-line

taken from [here](http://www.zsh.org/mla/users/2008/msg01013.html)
We want pressing v in command mode to take us to an editor (defined by the $VISUAL or $EDITOR variable or vi) to edit the current contents of the command line which (I believe) is a standard feature of bash vi-mode or other readline prompts (see [here](http://www.catonmat.net/download/bash-vi-editing-mode-cheat-sheet.pdf) and [here](http://www.catonmat.net/blog/bash-vi-editing-mode-cheat-sheet/) for source).
Don't lazy load the virtualenvwrapper.

Fix robbyrussell#2355.
Don't set RBENV_ROOT to "$HOME/.rbenv" when using Homebrew rbenv

Hard setting RBENV_ROOT to "$HOME/.rbenv" when using Homebrew's rbenv
will breaks it. It has to be set to $(brew --prefix rbenv).
Fix gwip alias in git plugin when no files to rm
Don't show useless '[]' when chruby_prompt_info is empty
Fixed errors if acpitool isn't installed on linux
added terminfo keys verification
Update key-bindings.zsh

Aligned comments
Aligned comments
Added a forward-delete fallback to bind Delete key

Delete key (of Fn+Delete on Mac) would print "~" instead of deletion.
Add irb to the list of bundled commands
Sort bundled commands alphabetically
Merge pull request #2619 from korylprince/master

Don't show useless '[]' when chruby_prompt_info is empty
Merge pull request #2620 from reedriley/master

Fixed errors if acpitool isn't installed on linux
Merge pull request #2616 from Bounga/master

Don't set RBENV_ROOT to "$HOME/.rbenv" when using Homebrew rbenv
Merge pull request #2615 from erbridge/fix_virtualenvwrapper_lazy

Don't lazy load the virtualenvwrapper