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Switch to Bash-It

## Additions
* LWRP for bash-it aliases, completion, plugins
* LWRP for custom plugin installation

## Removals
* The `bash_profile_include` LWRP
* `arch_flags` for Snow Leopard
* `lang_en`
* `ree_settings`
* recipe `gem_no_rdoc_no_ri` (replaced by `gem_setup`)

## Ported to Bash-It
* `better_history`
* `ctrl-o`
* `ctrl-s`
* `no_sudo_gem_install` (called by `gem_setup` now)
* `ec2_api_tools`

## Reimplemented by Bash-It
* bash path order
* PS1 management
* aliases
* git completion
* rbenv integration
* `rvm`
stop referencing bash_path_order recipe
Fix LWRP usage
stop requiring bash_it in bash_it_custom_plugin
fix bash_it_custom_plugin
fix link direction in bash-it feature lwrp
rename recipe
xmlstarlet
wget
watch
Viscosity VPN application
Things
siege
pwgen
psycopg2
phpstorm
optipng
mysql-python
jpegoptim